816224857 has 16 divisors (see below), whose sum is σ = 1000460160. Its totient is φ = 650287872.

The previous prime is 816224837. The next prime is 816224867. The reversal of 816224857 is 758422618.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 816224857 - 2¹¹ = 816222809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816224837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50848 + ... + 64945.

It is an arithmetic number, because the mean of its divisors is an integer number (62528760).

Almost surely, 2^816224857 is an apocalyptic number.

It is an amenable number.

816224857 is a deficient number, since it is larger than the sum of its proper divisors (184235303).

816224857 is a wasteful number, since it uses less digits than its factorization.

816224857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115872.

The product of its digits is 215040, while the sum is 43.

The square root of 816224857 is about 28569.6492278082. The cubic root of 816224857 is about 934.5515715970.

The spelling of 816224857 in words is "eight hundred sixteen million, two hundred twenty-four thousand, eight hundred fifty-seven".