78928520 has 32 divisors (see below), whose sum is σ = 193734720. Its totient is φ = 28701120.

The previous prime is 78928513. The next prime is 78928523. The reversal of 78928520 is 2582987.

It is a happy number.

It is a super-2 number, since 2×78928520² = 12459422538780800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78928523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89252 + ... + 90131.

It is an arithmetic number, because the mean of its divisors is an integer number (6054210).

Almost surely, 2^78928520 is an apocalyptic number.

It is an amenable number.

78928520 is an abundant number, since it is smaller than the sum of its proper divisors (114806200).

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

78928520 is a wasteful number, since it uses less digits than its factorization.

78928520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179405 (or 179401 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 78928520 is about 8884.1724431711. The cubic root of 78928520 is about 428.9545904559.

The spelling of 78928520 in words is "seventy-eight million, nine hundred twenty-eight thousand, five hundred twenty".