78538012 has 24 divisors (see below), whose sum is σ = 157280256. Its totient is φ = 33615408.

The previous prime is 78538007. The next prime is 78538043. The reversal of 78538012 is 21083587.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29613 + ... + 32155.

It is an arithmetic number, because the mean of its divisors is an integer number (6553344).

Almost surely, 2^78538012 is an apocalyptic number.

It is an amenable number.

78538012 is an abundant number, since it is smaller than the sum of its proper divisors (78742244).

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

78538012 is a wasteful number, since it uses less digits than its factorization.

78538012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3657 (or 3655 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 78538012 is about 8862.1674549740. The cubic root of 78538012 is about 428.2459863511.

The spelling of 78538012 in words is "seventy-eight million, five hundred thirty-eight thousand, twelve".