77138155 has 8 divisors (see below), whose sum is σ = 95067792. Its totient is φ = 60042528.

The previous prime is 77138147. The next prime is 77138177. The reversal of 77138155 is 55183177.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77138155 - 2³ = 77138147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

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, 208297 + ... + 208666.

It is an arithmetic number, because the mean of its divisors is an integer number (11883474).

Almost surely, 2^77138155 is an apocalyptic number.

77138155 is a deficient number, since it is larger than the sum of its proper divisors (17929637).

77138155 is a wasteful number, since it uses less digits than its factorization.

77138155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417005.

The product of its digits is 29400, while the sum is 37.

The square root of 77138155 is about 8782.8329712001. The cubic root of 77138155 is about 425.6863741859.

The spelling of 77138155 in words is "seventy-seven million, one hundred thirty-eight thousand, one hundred fifty-five".