77213910 has 32 divisors (see below), whose sum is σ = 195068160. Its totient is φ = 19506528.

The previous prime is 77213897. The next prime is 77213911. The reversal of 77213910 is 1931277.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77213911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67162 + ... + 68301.

It is an arithmetic number, because the mean of its divisors is an integer number (6095880).

Almost surely, 2^77213910 is an apocalyptic number.

77213910 is an abundant number, since it is smaller than the sum of its proper divisors (117854250).

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

77213910 is a wasteful number, since it uses less digits than its factorization.

77213910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135492.

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 77213910 is about 8787.1445874072. The cubic root of 77213910 is about 425.8256797409.

The spelling of 77213910 in words is "seventy-seven million, two hundred thirteen thousand, nine hundred ten".