77138554 has 16 divisors (see below), whose sum is σ = 123709248. Its totient is φ = 35946432.

The previous prime is 77138549. The next prime is 77138563. The reversal of 77138554 is 45583177.

77138554 = T₁₁₇₂ + T₁₁₇₃ + ... + T₁₂₇₄.

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, 7512 + ... + 14515.

It is an arithmetic number, because the mean of its divisors is an integer number (7731828).

Almost surely, 2^77138554 is an apocalyptic number.

77138554 is a deficient number, since it is larger than the sum of its proper divisors (46570694).

77138554 is a wasteful number, since it uses less digits than its factorization.

77138554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22149.

The product of its digits is 117600, while the sum is 40.

The square root of 77138554 is about 8782.8556859372. The cubic root of 77138554 is about 425.6871081442.

The spelling of 77138554 in words is "seventy-seven million, one hundred thirty-eight thousand, five hundred fifty-four".