77648920 has 32 divisors (see below), whose sum is σ = 182308320. Its totient is φ = 29708800.

The previous prime is 77648899. The next prime is 77648933. The reversal of 77648920 is 2984677.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41281 + ... + 43120.

It is an arithmetic number, because the mean of its divisors is an integer number (5697135).

Almost surely, 2^77648920 is an apocalyptic number.

It is an amenable number.

77648920 is an abundant number, since it is smaller than the sum of its proper divisors (104659400).

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

77648920 is a wasteful number, since it uses less digits than its factorization.

77648920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84435 (or 84431 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 77648920 is about 8811.8624592080. The cubic root of 77648920 is about 426.6238590950.

The spelling of 77648920 in words is "seventy-seven million, six hundred forty-eight thousand, nine hundred twenty".