78390528 has 36 divisors (see below), whose sum is σ = 208635168. Its totient is φ = 26129920.

The previous prime is 78390517. The next prime is 78390541. The reversal of 78390528 is 82509387.

It is a super-2 number, since 2×78390528² = 12290149760237568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78390528.

It is a congruent number.

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, 50268 + ... + 51803.

Almost surely, 2^78390528 is an apocalyptic number.

It is an amenable number.

78390528 is an abundant number, since it is smaller than the sum of its proper divisors (130244640).

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

78390528 is a wasteful number, since it uses less digits than its factorization.

78390528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102090 (or 102076 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 78390528 is about 8853.8425556365. The cubic root of 78390528 is about 427.9777552709.

The spelling of 78390528 in words is "seventy-eight million, three hundred ninety thousand, five hundred twenty-eight".