816120635 has 16 divisors (see below), whose sum is σ = 1084326912. Its totient is φ = 584680800.

The previous prime is 816120631. The next prime is 816120667. The reversal of 816120635 is 536021618.

It is a happy number.

It is not a de Polignac number, because 816120635 - 2² = 816120631 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816120631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107051 + ... + 114420.

It is an arithmetic number, because the mean of its divisors is an integer number (67770432).

Almost surely, 2^816120635 is an apocalyptic number.

816120635 is a deficient number, since it is larger than the sum of its proper divisors (268206277).

816120635 is a wasteful number, since it uses less digits than its factorization.

816120635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221554.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 816120635 is about 28567.8251709856. The cubic root of 816120635 is about 934.5117929425.

The spelling of 816120635 in words is "eight hundred sixteen million, one hundred twenty thousand, six hundred thirty-five".