77638612 has 6 divisors (see below), whose sum is σ = 135867578. Its totient is φ = 38819304.

The previous prime is 77638577. The next prime is 77638621. The reversal of 77638612 is 21683677.

It can be written as a sum of positive squares in only one way, i.e., 57244356 + 20394256 = 7566^2 + 4516^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9704823 + ... + 9704830.

Almost surely, 2^77638612 is an apocalyptic number.

It is an amenable number.

77638612 is a deficient number, since it is larger than the sum of its proper divisors (58228966).

77638612 is a wasteful number, since it uses less digits than its factorization.

77638612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19409657 (or 19409655 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 77638612 is about 8811.2775464174. The cubic root of 77638612 is about 426.6049799599.

The spelling of 77638612 in words is "seventy-seven million, six hundred thirty-eight thousand, six hundred twelve".