76721808 has 20 divisors (see below), whose sum is σ = 198198128. Its totient is φ = 25573920.

The previous prime is 76721803. The next prime is 76721809. The reversal of 76721808 is 80812767.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (76721803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799138 + ... + 799233.

Almost surely, 2^76721808 is an apocalyptic number.

It is an amenable number.

76721808 is an abundant number, since it is smaller than the sum of its proper divisors (121476320).

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

76721808 is a wasteful number, since it uses less digits than its factorization.

76721808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598382 (or 1598376 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 76721808 is about 8759.0985837585. The cubic root of 76721808 is about 424.9191227877.

The spelling of 76721808 in words is "seventy-six million, seven hundred twenty-one thousand, eight hundred eight".