77439934 has 32 divisors (see below), whose sum is σ = 143660160. Its totient is φ = 30780000.

The previous prime is 77439893. The next prime is 77439937. The reversal of 77439934 is 43993477.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77439937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1692 + ... + 12559.

It is an arithmetic number, because the mean of its divisors is an integer number (4489380).

Almost surely, 2^77439934 is an apocalyptic number.

77439934 is a deficient number, since it is larger than the sum of its proper divisors (66220226).

77439934 is a wasteful number, since it uses less digits than its factorization.

77439934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14296.

The product of its digits is 571536, while the sum is 46.

The square root of 77439934 is about 8799.9962499992. The cubic root of 77439934 is about 426.2407736154.

The spelling of 77439934 in words is "seventy-seven million, four hundred thirty-nine thousand, nine hundred thirty-four".