76836643816 has 32 divisors (see below), whose sum is σ = 144402980040. Its totient is φ = 38329274368.

The previous prime is 76836643811. The next prime is 76836643831. The reversal of 76836643816 is 61834663867.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 43745395716 + 33091248100 = 209154^2 + 181910^2 .

It is not an unprimeable number, because it can be changed into a prime (76836643811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8371806 + ... + 8380978.

Almost surely, 2^76836643816 is an apocalyptic number.

It is an amenable number.

76836643816 is a deficient number, since it is larger than the sum of its proper divisors (67566336224).

76836643816 is a wasteful number, since it uses less digits than its factorization.

76836643816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11493 (or 11489 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 58.

The spelling of 76836643816 in words is "seventy-six billion, eight hundred thirty-six million, six hundred forty-three thousand, eight hundred sixteen".