78797172 has 24 divisors (see below), whose sum is σ = 191854656. Its totient is φ = 25123648.

The previous prime is 78797143. The next prime is 78797179. The reversal of 78797172 is 27179787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78797179) by changing a digit.

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, 142473 + ... + 143024.

It is an arithmetic number, because the mean of its divisors is an integer number (7993944).

Almost surely, 2^78797172 is an apocalyptic number.

It is an amenable number.

78797172 is an abundant number, since it is smaller than the sum of its proper divisors (113057484).

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

78797172 is a wasteful number, since it uses less digits than its factorization.

78797172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285527 (or 285525 counting only the distinct ones).

The product of its digits is 345744, while the sum is 48.

The square root of 78797172 is about 8876.7771178508. Note that the first 3 decimals coincide. The cubic root of 78797172 is about 428.7165117053.

It can be divided in two parts, 7879 and 7172, that added together give a palindrome (15051).

The spelling of 78797172 in words is "seventy-eight million, seven hundred ninety-seven thousand, one hundred seventy-two".