76538813 has 4 divisors (see below), whose sum is σ = 82426428. Its totient is φ = 70651200.

The previous prime is 76538809. The next prime is 76538827. The reversal of 76538813 is 31883567.

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 4169764 + 72369049 = 2042^2 + 8507^2 .

It is a cyclic number.

It is not a de Polignac number, because 76538813 - 2² = 76538809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76538863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2943788 + ... + 2943813.

It is an arithmetic number, because the mean of its divisors is an integer number (20606607).

Almost surely, 2^76538813 is an apocalyptic number.

It is an amenable number.

76538813 is a deficient number, since it is larger than the sum of its proper divisors (5887615).

76538813 is a wasteful number, since it uses less digits than its factorization.

76538813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5887614.

The product of its digits is 120960, while the sum is 41.

The square root of 76538813 is about 8748.6463524365. The cubic root of 76538813 is about 424.5810182288.

The spelling of 76538813 in words is "seventy-six million, five hundred thirty-eight thousand, eight hundred thirteen".