77439634 has 4 divisors (see below), whose sum is σ = 116159454. Its totient is φ = 38719816.

The previous prime is 77439619. The next prime is 77439653. The reversal of 77439634 is 43693477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43693477 = 31 ⋅1409467.

It can be written as a sum of positive squares in only one way, i.e., 73017025 + 4422609 = 8545^2 + 2103^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19359907 + ... + 19359910.

Almost surely, 2^77439634 is an apocalyptic number.

77439634 is a deficient number, since it is larger than the sum of its proper divisors (38719820).

77439634 is a wasteful number, since it uses less digits than its factorization.

77439634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38719819.

The product of its digits is 381024, while the sum is 43.

The square root of 77439634 is about 8799.9792045209. The cubic root of 77439634 is about 426.2402232000.

The spelling of 77439634 in words is "seventy-seven million, four hundred thirty-nine thousand, six hundred thirty-four".