816656 has 20 divisors (see below), whose sum is σ = 1620432. Its totient is φ = 398496.

The previous prime is 816653. The next prime is 816667. The reversal of 816656 is 656618.

816656 = T₁₇₃ + T₁₇₄ + ... + T₂₁₅.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (816653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95 + ... + 1281.

2⁸¹⁶⁶⁵⁶ is an apocalyptic number.

816656 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

816656 is a deficient number, since it is larger than the sum of its proper divisors (803776).

816656 is a wasteful number, since it uses less digits than its factorization.

816656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238 (or 1232 counting only the distinct ones).

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

The square root of 816656 is about 903.6902124069. The cubic root of 816656 is about 93.4716090986.

The spelling of 816656 in words is "eight hundred sixteen thousand, six hundred fifty-six".