816446457 has 6 divisors (see below), whose sum is σ = 1179311562. Its totient is φ = 544297632.

The previous prime is 816446443. The next prime is 816446513. The reversal of 816446457 is 754644618.

816446457 is a `hidden beast` number, since 81 + 64 + 464 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 804913641 + 11532816 = 28371^2 + 3396^2 .

It is not a de Polignac number, because 816446457 - 2⁴ = 816446441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816446857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45358128 + ... + 45358145.

It is an arithmetic number, because the mean of its divisors is an integer number (196551927).

Almost surely, 2^816446457 is an apocalyptic number.

It is an amenable number.

816446457 is a deficient number, since it is larger than the sum of its proper divisors (362865105).

816446457 is a wasteful number, since it uses less digits than its factorization.

816446457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90716279 (or 90716276 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 816446457 is about 28573.5272061396. The cubic root of 816446457 is about 934.6361389347.

The spelling of 816446457 in words is "eight hundred sixteen million, four hundred forty-six thousand, four hundred fifty-seven".