816853632 has 64 divisors (see below), whose sum is σ = 2479742400. Its totient is φ = 233385984.

The previous prime is 816853523. The next prime is 816853637. The reversal of 816853632 is 236358618.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×816853632² = 1334499712223182848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (816853637) 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, 149257 + ... + 154632.

It is an arithmetic number, because the mean of its divisors is an integer number (38745975).

Almost surely, 2^816853632 is an apocalyptic number.

It is an amenable number.

816853632 is an abundant number, since it is smaller than the sum of its proper divisors (1662888768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816853632 is a wasteful number, since it uses less digits than its factorization.

816853632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303913 (or 303901 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 816853632 is about 28580.6513571682. The cubic root of 816853632 is about 934.7914858123.

The spelling of 816853632 in words is "eight hundred sixteen million, eight hundred fifty-three thousand, six hundred thirty-two".