78809536 has 28 divisors (see below), whose sum is σ = 168419272. Its totient is φ = 36373248.

The previous prime is 78809483. The next prime is 78809573. The reversal of 78809536 is 63590887.

It is a congruent number.

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, 46530 + ... + 48193.

It is an arithmetic number, because the mean of its divisors is an integer number (6014974).

Almost surely, 2^78809536 is an apocalyptic number.

It is an amenable number.

78809536 is an abundant number, since it is smaller than the sum of its proper divisors (89609736).

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

78809536 is a wasteful number, since it uses less digits than its factorization.

78809536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94748 (or 94738 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 78809536 is about 8877.4735144634. The cubic root of 78809536 is about 428.7389337186.

The spelling of 78809536 in words is "seventy-eight million, eight hundred nine thousand, five hundred thirty-six".