78815152 has 20 divisors (see below), whose sum is σ = 164451280. Its totient is φ = 36376128.

The previous prime is 78815147. The next prime is 78815153. The reversal of 78815152 is 25151887.

It is not an unprimeable number, because it can be changed into a prime (78815153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189252 + ... + 189667.

It is an arithmetic number, because the mean of its divisors is an integer number (8222564).

Almost surely, 2^78815152 is an apocalyptic number.

It is an amenable number.

78815152 is an abundant number, since it is smaller than the sum of its proper divisors (85636128).

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

78815152 is a wasteful number, since it uses less digits than its factorization.

78815152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378940 (or 378934 counting only the distinct ones).

The product of its digits is 22400, while the sum is 37.

The square root of 78815152 is about 8877.7898150384. The cubic root of 78815152 is about 428.7491175144.

The spelling of 78815152 in words is "seventy-eight million, eight hundred fifteen thousand, one hundred fifty-two".