77615664 has 40 divisors (see below), whose sum is σ = 229152000. Its totient is φ = 22175808.

The previous prime is 77615663. The next prime is 77615719. The reversal of 77615664 is 46651677.

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 (77615663) 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, 115164 + ... + 115835.

It is an arithmetic number, because the mean of its divisors is an integer number (5728800).

Almost surely, 2^77615664 is an apocalyptic number.

It is an amenable number.

77615664 is an abundant number, since it is smaller than the sum of its proper divisors (151536336).

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

77615664 is a wasteful number, since it uses less digits than its factorization.

77615664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231017 (or 231011 counting only the distinct ones).

The product of its digits is 211680, while the sum is 42.

The square root of 77615664 is about 8809.9752553569. The cubic root of 77615664 is about 426.5629446224.

The spelling of 77615664 in words is "seventy-seven million, six hundred fifteen thousand, six hundred sixty-four".