77138612 has 6 divisors (see below), whose sum is σ = 134992578. Its totient is φ = 38569304.

The previous prime is 77138591. The next prime is 77138617. The reversal of 77138612 is 21683177.

It can be written as a sum of positive squares in only one way, i.e., 64705936 + 12432676 = 8044^2 + 3526^2 .

It is a super-2 number, since 2×77138612² = 11900730922573088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77138617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9642323 + ... + 9642330.

It is an arithmetic number, because the mean of its divisors is an integer number (22498763).

Almost surely, 2^77138612 is an apocalyptic number.

It is an amenable number.

77138612 is a deficient number, since it is larger than the sum of its proper divisors (57853966).

77138612 is a wasteful number, since it uses less digits than its factorization.

77138612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19284657 (or 19284655 counting only the distinct ones).

The product of its digits is 14112, while the sum is 35.

The square root of 77138612 is about 8782.8589878240. The cubic root of 77138612 is about 425.6872148347.

The spelling of 77138612 in words is "seventy-seven million, one hundred thirty-eight thousand, six hundred twelve".