78937520 has 20 divisors (see below), whose sum is σ = 183529920. Its totient is φ = 31574976.

The previous prime is 78937519. The next prime is 78937543. The reversal of 78937520 is 2573987.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×78937520² = 12462264127500800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493280 + ... + 493439.

It is an arithmetic number, because the mean of its divisors is an integer number (9176496).

Almost surely, 2^78937520 is an apocalyptic number.

It is an amenable number.

78937520 is an abundant number, since it is smaller than the sum of its proper divisors (104592400).

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

78937520 is a wasteful number, since it uses less digits than its factorization.

78937520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986732 (or 986726 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 78937520 is about 8884.6789474916. The cubic root of 78937520 is about 428.9708940032.

The spelling of 78937520 in words is "seventy-eight million, nine hundred thirty-seven thousand, five hundred twenty".