77556313 has 4 divisors (see below), whose sum is σ = 77591268. Its totient is φ = 77521360.

The previous prime is 77556289. The next prime is 77556317. The reversal of 77556313 is 31365577.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 257049 + 77299264 = 507^2 + 8792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77556313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77556317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13906 + ... + 18667.

It is an arithmetic number, because the mean of its divisors is an integer number (19397817).

Almost surely, 2^77556313 is an apocalyptic number.

It is an amenable number.

77556313 is a deficient number, since it is larger than the sum of its proper divisors (34955).

77556313 is a wasteful number, since it uses less digits than its factorization.

77556313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34954.

The product of its digits is 66150, while the sum is 37.

The square root of 77556313 is about 8806.6062135195. The cubic root of 77556313 is about 426.4541891133.

The spelling of 77556313 in words is "seventy-seven million, five hundred fifty-six thousand, three hundred thirteen".