77704872 has 32 divisors (see below), whose sum is σ = 222014400. Its totient is φ = 22201344.

The previous prime is 77704867. The next prime is 77704873. The reversal of 77704872 is 27840777.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (77704873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231097 + ... + 231432.

It is an arithmetic number, because the mean of its divisors is an integer number (6937950).

Almost surely, 2^77704872 is an apocalyptic number.

It is an amenable number.

77704872 is an abundant number, since it is smaller than the sum of its proper divisors (144309528).

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

77704872 is a wasteful number, since it uses less digits than its factorization.

77704872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462545 (or 462541 counting only the distinct ones).

The product of its (nonzero) digits is 153664, while the sum is 42.

The square root of 77704872 is about 8815.0366987325. The cubic root of 77704872 is about 426.7263062248.

The spelling of 77704872 in words is "seventy-seven million, seven hundred four thousand, eight hundred seventy-two".