78991752 has 64 divisors (see below), whose sum is σ = 235514880. Its totient is φ = 21586752.

The previous prime is 78991733. The next prime is 78991753. The reversal of 78991752 is 25719987.

It is not an unprimeable number, because it can be changed into a prime (78991753) 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 15 ways as a sum of consecutive naturals, for example, 6358 + ... + 14085.

It is an arithmetic number, because the mean of its divisors is an integer number (3679920).

Almost surely, 2^78991752 is an apocalyptic number.

It is an amenable number.

78991752 is an abundant number, since it is smaller than the sum of its proper divisors (156523128).

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

78991752 is a wasteful number, since it uses less digits than its factorization.

78991752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20482 (or 20478 counting only the distinct ones).

The product of its digits is 317520, while the sum is 48.

The square root of 78991752 is about 8887.7304189540. The cubic root of 78991752 is about 429.0691093340.

The spelling of 78991752 in words is "seventy-eight million, nine hundred ninety-one thousand, seven hundred fifty-two".