77213408 has 24 divisors (see below), whose sum is σ = 152250840. Its totient is φ = 38546560.

The previous prime is 77213407. The next prime is 77213417. The reversal of 77213408 is 80431277.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77213407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24803 + ... + 27741.

It is an arithmetic number, because the mean of its divisors is an integer number (6343785).

Almost surely, 2^77213408 is an apocalyptic number.

It is an amenable number.

77213408 is a deficient number, since it is larger than the sum of its proper divisors (75037432).

77213408 is a wasteful number, since it uses less digits than its factorization.

77213408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3770 (or 3762 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 77213408 is about 8787.1160229054. The cubic root of 77213408 is about 425.8247569152.

The spelling of 77213408 in words is "seventy-seven million, two hundred thirteen thousand, four hundred eight".