76816815 has 16 divisors (see below), whose sum is σ = 123125856. Its totient is φ = 40896000.

The previous prime is 76816813. The next prime is 76816819. The reversal of 76816815 is 51861867.

It is not a de Polignac number, because 76816815 - 2¹ = 76816813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76816811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4755 + ... + 13275.

It is an arithmetic number, because the mean of its divisors is an integer number (7695366).

Almost surely, 2^76816815 is an apocalyptic number.

76816815 is a deficient number, since it is larger than the sum of its proper divisors (46309041).

76816815 is a wasteful number, since it uses less digits than its factorization.

76816815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130.

The product of its digits is 80640, while the sum is 42.

The square root of 76816815 is about 8764.5202378681. The cubic root of 76816815 is about 425.0944472910.

The spelling of 76816815 in words is "seventy-six million, eight hundred sixteen thousand, eight hundred fifteen".