816539626 has 16 divisors (see below), whose sum is σ = 1428350400. Its totient is φ = 349945260.

The previous prime is 816539621. The next prime is 816539639. The reversal of 816539626 is 626935618.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (816539621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594460 + ... + 595831.

It is an arithmetic number, because the mean of its divisors is an integer number (89271900).

Almost surely, 2^816539626 is an apocalyptic number.

816539626 is a deficient number, since it is larger than the sum of its proper divisors (611810774).

816539626 is a wasteful number, since it uses less digits than its factorization.

816539626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190314 (or 1190300 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 816539626 is about 28575.1574973787. The cubic root of 816539626 is about 934.6716896645.

The spelling of 816539626 in words is "eight hundred sixteen million, five hundred thirty-nine thousand, six hundred twenty-six".