77138613 has 12 divisors (see below), whose sum is σ = 117287040. Its totient is φ = 48719016.

The previous prime is 77138591. The next prime is 77138617. The reversal of 77138613 is 31683177.

77138613 is a `hidden beast` number, since 7 + 7 + 1 + 38 + 613 = 666.

It is not a de Polignac number, because 77138613 - 2⁶ = 77138549 is a prime.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 225381 + ... + 225722.

It is an arithmetic number, because the mean of its divisors is an integer number (9773920).

Almost surely, 2^77138613 is an apocalyptic number.

It is an amenable number.

77138613 is a deficient number, since it is larger than the sum of its proper divisors (40148427).

77138613 is a wasteful number, since it uses less digits than its factorization.

77138613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451128 (or 451125 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 77138613 is about 8782.8590447530. The cubic root of 77138613 is about 425.6872166742.

The spelling of 77138613 in words is "seventy-seven million, one hundred thirty-eight thousand, six hundred thirteen".