77969138 has 16 divisors (see below), whose sum is σ = 129355800. Its totient is φ = 35012736.

The previous prime is 77969107. The next prime is 77969153. The reversal of 77969138 is 83196977.

It can be written as a sum of positive squares in 4 ways, for example, as 54125449 + 23843689 = 7357^2 + 4883^2 .

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, 39563 + ... + 41486.

Almost surely, 2^77969138 is an apocalyptic number.

77969138 is a deficient number, since it is larger than the sum of its proper divisors (51386662).

77969138 is a wasteful number, since it uses less digits than its factorization.

77969138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81101.

The product of its digits is 571536, while the sum is 50.

The square root of 77969138 is about 8830.0134767734. The cubic root of 77969138 is about 427.2095091154.

The spelling of 77969138 in words is "seventy-seven million, nine hundred sixty-nine thousand, one hundred thirty-eight".