77215460 has 24 divisors (see below), whose sum is σ = 185317440. Its totient is φ = 26473824.

The previous prime is 77215459. The next prime is 77215471. The reversal of 77215460 is 6451277.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275630 + ... + 275909.

It is an arithmetic number, because the mean of its divisors is an integer number (7721560).

Almost surely, 2^77215460 is an apocalyptic number.

77215460 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77215460 is an abundant number, since it is smaller than the sum of its proper divisors (108101980).

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

77215460 is a wasteful number, since it uses less digits than its factorization.

77215460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551555 (or 551553 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 77215460 is about 8787.2327839884. The cubic root of 77215460 is about 425.8285290781.

The spelling of 77215460 in words is "seventy-seven million, two hundred fifteen thousand, four hundred sixty".