671939040 has 96 divisors (see below), whose sum is σ = 2137314816. Its totient is φ = 177431040.

The previous prime is 671939039. The next prime is 671939041. The reversal of 671939040 is 40939176.

It is an interprime number because it is at equal distance from previous prime (671939039) and next prime (671939041).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×671939040² = 903004146952243200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 671939040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671939041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42645 + ... + 56235.

It is an arithmetic number, because the mean of its divisors is an integer number (22263696).

Almost surely, 2^671939040 is an apocalyptic number.

671939040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671939040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068657408).

671939040 is an abundant number, since it is smaller than the sum of its proper divisors (1465375776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671939040 is a wasteful number, since it uses less digits than its factorization.

671939040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13712 (or 13704 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 671939040 is about 25921.7869754382. The cubic root of 671939040 is about 875.8773415133.

The spelling of 671939040 in words is "six hundred seventy-one million, nine hundred thirty-nine thousand, forty".