77313569 has 6 divisors (see below), whose sum is σ = 82129254. Its totient is φ = 72765440.

The previous prime is 77313547. The next prime is 77313589. The reversal of 77313569 is 96531377.

It can be written as a sum of positive squares in 3 ways, for example, as 49350625 + 27962944 = 7025^2 + 5288^2 .

It is not a de Polignac number, because 77313569 - 2¹² = 77309473 is a prime.

It is a super-2 number, since 2×77313569² = 11954775903035522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77313539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 133472 + ... + 134049.

It is an arithmetic number, because the mean of its divisors is an integer number (13688209).

Almost surely, 2^77313569 is an apocalyptic number.

It is an amenable number.

77313569 is a deficient number, since it is larger than the sum of its proper divisors (4815685).

77313569 is a wasteful number, since it uses less digits than its factorization.

77313569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267555 (or 267538 counting only the distinct ones).

The product of its digits is 119070, while the sum is 41.

The square root of 77313569 is about 8792.8134860237. The cubic root of 77313569 is about 426.0088035534.

The spelling of 77313569 in words is "seventy-seven million, three hundred thirteen thousand, five hundred sixty-nine".