816641400 has 48 divisors (see below), whose sum is σ = 2531590200. Its totient is φ = 217770880.

The previous prime is 816641389. The next prime is 816641429. The reversal of 816641400 is 4146618.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 679935 + ... + 681134.

Almost surely, 2^816641400 is an apocalyptic number.

It is an amenable number.

816641400 is an abundant number, since it is smaller than the sum of its proper divisors (1714948800).

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

816641400 is a wasteful number, since it uses less digits than its factorization.

816641400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361088 (or 1361079 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 816641400 is about 28576.9382544737. The cubic root of 816641400 is about 934.7105207356.

The spelling of 816641400 in words is "eight hundred sixteen million, six hundred forty-one thousand, four hundred".