78621892 has 12 divisors (see below), whose sum is σ = 141307180. Its totient is φ = 38248416.

The previous prime is 78621839. The next prime is 78621911. The reversal of 78621892 is 29812687.

It can be written as a sum of positive squares in 2 ways, for example, as 57517056 + 21104836 = 7584^2 + 4594^2 .

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, 265467 + ... + 265762.

Almost surely, 2^78621892 is an apocalyptic number.

It is an amenable number.

78621892 is a deficient number, since it is larger than the sum of its proper divisors (62685288).

78621892 is a wasteful number, since it uses less digits than its factorization.

78621892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531270 (or 531268 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 78621892 is about 8866.8986686440. The cubic root of 78621892 is about 428.3983902288.

The spelling of 78621892 in words is "seventy-eight million, six hundred twenty-one thousand, eight hundred ninety-two".