78478252 has 12 divisors (see below), whose sum is σ = 137540536. Its totient is φ = 39180960.

The previous prime is 78478249. The next prime is 78478261. The reversal of 78478252 is 25287487.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78478199 and 78478208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11433 + ... + 16960.

Almost surely, 2^78478252 is an apocalyptic number.

It is an amenable number.

78478252 is a deficient number, since it is larger than the sum of its proper divisors (59062284).

78478252 is a wasteful number, since it uses less digits than its factorization.

78478252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29088 (or 29086 counting only the distinct ones).

The product of its digits is 250880, while the sum is 43.

The square root of 78478252 is about 8858.7951776751. The cubic root of 78478252 is about 428.1373405575.

The spelling of 78478252 in words is "seventy-eight million, four hundred seventy-eight thousand, two hundred fifty-two".