76864657 has 4 divisors (see below), whose sum is σ = 76884660. Its totient is φ = 76844656.

The previous prime is 76864621. The next prime is 76864661. The reversal of 76864657 is 75646867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75646867 = 131 ⋅577457.

It can be written as a sum of positive squares in 2 ways, for example, as 42302016 + 34562641 = 6504^2 + 5879^2 .

It is a cyclic number.

It is not a de Polignac number, because 76864657 - 2¹⁵ = 76831889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76864657.

It is not an unprimeable number, because it can be changed into a prime (76864057) 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, 2218 + ... + 12595.

It is an arithmetic number, because the mean of its divisors is an integer number (19221165).

Almost surely, 2^76864657 is an apocalyptic number.

It is an amenable number.

76864657 is a deficient number, since it is larger than the sum of its proper divisors (20003).

76864657 is a wasteful number, since it uses less digits than its factorization.

76864657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20002.

The product of its digits is 1693440, while the sum is 49.

The square root of 76864657 is about 8767.2491124640. The cubic root of 76864657 is about 425.1826794830.

The spelling of 76864657 in words is "seventy-six million, eight hundred sixty-four thousand, six hundred fifty-seven".