78791544 has 48 divisors (see below), whose sum is σ = 229811400. Its totient is φ = 24243264.

The previous prime is 78791543. The next prime is 78791567. The reversal of 78791544 is 44519787.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 78791544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78791543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41154 + ... + 43025.

Almost surely, 2^78791544 is an apocalyptic number.

It is an amenable number.

78791544 is an abundant number, since it is smaller than the sum of its proper divisors (151019856).

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

78791544 is a wasteful number, since it uses less digits than its factorization.

78791544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84204 (or 84197 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 78791544 is about 8876.4601052447. The cubic root of 78791544 is about 428.7063045962.

The spelling of 78791544 in words is "seventy-eight million, seven hundred ninety-one thousand, five hundred forty-four".