77664894 has 16 divisors (see below), whose sum is σ = 163505280. Its totient is φ = 24525720.

The previous prime is 77664869. The next prime is 77664931. The reversal of 77664894 is 49846677.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340522 + ... + 340749.

It is an arithmetic number, because the mean of its divisors is an integer number (10219080).

Almost surely, 2^77664894 is an apocalyptic number.

77664894 is an abundant number, since it is smaller than the sum of its proper divisors (85840386).

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

77664894 is a wasteful number, since it uses less digits than its factorization.

77664894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681295.

The product of its digits is 2032128, while the sum is 51.

The square root of 77664894 is about 8812.7688044110. The cubic root of 77664894 is about 426.6531122267.

The spelling of 77664894 in words is "seventy-seven million, six hundred sixty-four thousand, eight hundred ninety-four".