816559936 has 28 divisors (see below), whose sum is σ = 1659887460. Its totient is φ = 398320640.

The previous prime is 816559927. The next prime is 816559957. The reversal of 816559936 is 639955618.

It can be written as a sum of positive squares in 2 ways, for example, as 267126336 + 549433600 = 16344^2 + 23440^2 .

It is a super-3 number, since 3×816559936³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152971 + ... + 158218.

It is an arithmetic number, because the mean of its divisors is an integer number (59281695).

Almost surely, 2^816559936 is an apocalyptic number.

It is an amenable number.

816559936 is an abundant number, since it is smaller than the sum of its proper divisors (843327524).

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

816559936 is a wasteful number, since it uses less digits than its factorization.

816559936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311242 (or 311232 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 52.

The square root of 816559936 is about 28575.5128737876. The cubic root of 816559936 is about 934.6794390434.

The spelling of 816559936 in words is "eight hundred sixteen million, five hundred fifty-nine thousand, nine hundred thirty-six".