671239680 has 160 divisors (see below), whose sum is σ = 2177860608. Its totient is φ = 176332800.

The previous prime is 671239661. The next prime is 671239687. The reversal of 671239680 is 86932176.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671239687) by changing a digit.

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, 544665 + ... + 545895.

Almost surely, 2^671239680 is an apocalyptic number.

671239680 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 671239680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088930304).

671239680 is an abundant number, since it is smaller than the sum of its proper divisors (1506620928).

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

671239680 is a wasteful number, since it uses less digits than its factorization.

671239680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 671239680 is about 25908.2936528055. The cubic root of 671239680 is about 875.5733624412.

The spelling of 671239680 in words is "six hundred seventy-one million, two hundred thirty-nine thousand, six hundred eighty".