78621808 has 20 divisors (see below), whose sum is σ = 152492968. Its totient is φ = 39268800.

The previous prime is 78621793. The next prime is 78621811. The reversal of 78621808 is 80812687.

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, 17383 + ... + 21433.

Almost surely, 2^78621808 is an apocalyptic number.

It is an amenable number.

78621808 is a deficient number, since it is larger than the sum of its proper divisors (73871160).

78621808 is a wasteful number, since it uses less digits than its factorization.

78621808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5272 (or 5266 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 78621808 is about 8866.8939319245. The cubic root of 78621808 is about 428.3982376611.

The spelling of 78621808 in words is "seventy-eight million, six hundred twenty-one thousand, eight hundred eight".