77313955 has 4 divisors (see below), whose sum is σ = 92776752. Its totient is φ = 61851160.

The previous prime is 77313949. The next prime is 77313989. The reversal of 77313955 is 55931377.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 77313955 - 2¹³ = 77305763 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7731391 + ... + 7731400.

It is an arithmetic number, because the mean of its divisors is an integer number (23194188).

Almost surely, 2^77313955 is an apocalyptic number.

77313955 is a deficient number, since it is larger than the sum of its proper divisors (15462797).

77313955 is a wasteful number, since it uses less digits than its factorization.

77313955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15462796.

The product of its digits is 99225, while the sum is 40.

The square root of 77313955 is about 8792.8354357397. The cubic root of 77313955 is about 426.0095125239.

The spelling of 77313955 in words is "seventy-seven million, three hundred thirteen thousand, nine hundred fifty-five".