76520681 has 4 divisors (see below), whose sum is σ = 77309652. Its totient is φ = 75731712.

The previous prime is 76520669. The next prime is 76520737. The reversal of 76520681 is 18602567.

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 31416025 + 45104656 = 5605^2 + 6716^2 .

It is a cyclic number.

It is not a de Polignac number, because 76520681 - 2¹⁸ = 76258537 is a prime.

It is a super-2 number, since 2×76520681² = 11710829241407522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76520641) 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, 394340 + ... + 394533.

It is an arithmetic number, because the mean of its divisors is an integer number (19327413).

Almost surely, 2^76520681 is an apocalyptic number.

It is an amenable number.

76520681 is a deficient number, since it is larger than the sum of its proper divisors (788971).

76520681 is an equidigital number, since it uses as much as digits as its factorization.

76520681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788970.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 76520681 is about 8747.6100164559. The cubic root of 76520681 is about 424.5474879160.

The spelling of 76520681 in words is "seventy-six million, five hundred twenty thousand, six hundred eighty-one".