816538190 has 16 divisors (see below), whose sum is σ = 1582828128. Its totient is φ = 301490976.

The previous prime is 816538189. The next prime is 816538211. The reversal of 816538190 is 91835618.

It is a super-2 number, since 2×816538190² = 1333469231456952200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3140402 + ... + 3140661.

It is an arithmetic number, because the mean of its divisors is an integer number (98926758).

Almost surely, 2^816538190 is an apocalyptic number.

816538190 is a deficient number, since it is larger than the sum of its proper divisors (766289938).

816538190 is a wasteful number, since it uses less digits than its factorization.

816538190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6281083.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 816538190 is about 28575.1323706470. The cubic root of 816538190 is about 934.6711417469.

The spelling of 816538190 in words is "eight hundred sixteen million, five hundred thirty-eight thousand, one hundred ninety".