77956155 has 16 divisors (see below), whose sum is σ = 138588960. Its totient is φ = 41576544.

The previous prime is 77956141. The next prime is 77956159. The reversal of 77956155 is 55165977.

It is a happy number.

It is not a de Polignac number, because 77956155 - 2⁴ = 77956139 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 77956155.

It is not an unprimeable number, because it can be changed into a prime (77956159) 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, 288592 + ... + 288861.

It is an arithmetic number, because the mean of its divisors is an integer number (8661810).

Almost surely, 2^77956155 is an apocalyptic number.

77956155 is a deficient number, since it is larger than the sum of its proper divisors (60632805).

77956155 is a wasteful number, since it uses less digits than its factorization.

77956155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577467 (or 577461 counting only the distinct ones).

The product of its digits is 330750, while the sum is 45.

The square root of 77956155 is about 8829.2782830761. The cubic root of 77956155 is about 427.1857955920.

The spelling of 77956155 in words is "seventy-seven million, nine hundred fifty-six thousand, one hundred fifty-five".