77138081 has 16 divisors (see below), whose sum is σ = 83995200. Its totient is φ = 70590528.

The previous prime is 77138077. The next prime is 77138093. The reversal of 77138081 is 18083177.

It is a cyclic number.

It is not a de Polignac number, because 77138081 - 2² = 77138077 is a prime.

It is a super-2 number, since 2×77138081² = 11900567080725122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77138011) 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, 125531 + ... + 126143.

It is an arithmetic number, because the mean of its divisors is an integer number (5249700).

Almost surely, 2^77138081 is an apocalyptic number.

It is an amenable number.

77138081 is a deficient number, since it is larger than the sum of its proper divisors (6857119).

77138081 is a wasteful number, since it uses less digits than its factorization.

77138081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 77138081 is about 8782.8287584354. The cubic root of 77138081 is about 425.6862380631.

The spelling of 77138081 in words is "seventy-seven million, one hundred thirty-eight thousand, eighty-one".