671245440 has 128 divisors (see below), whose sum is σ = 2192037120. Its totient is φ = 174612480.

The previous prime is 671245429. The next prime is 671245499. The reversal of 671245440 is 44542176.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74457 + ... + 82983.

It is an arithmetic number, because the mean of its divisors is an integer number (17125290).

Almost surely, 2^671245440 is an apocalyptic number.

671245440 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 671245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096018560).

671245440 is an abundant number, since it is smaller than the sum of its proper divisors (1520791680).

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

671245440 is a wasteful number, since it uses less digits than its factorization.

671245440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8590 (or 8578 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 671245440 is about 25908.4048138823. The cubic root of 671245440 is about 875.5758669059.

The spelling of 671245440 in words is "six hundred seventy-one million, two hundred forty-five thousand, four hundred forty".