817679442 has 32 divisors (see below), whose sum is σ = 1668304512. Its totient is φ = 267081984.

The previous prime is 817679411. The next prime is 817679453. The reversal of 817679442 is 244976718.

It is a junction number, because it is equal to n+sod(n) for n = 817679391 and 817679400.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459258 + ... + 461034.

It is an arithmetic number, because the mean of its divisors is an integer number (52134516).

Almost surely, 2^817679442 is an apocalyptic number.

817679442 is an abundant number, since it is smaller than the sum of its proper divisors (850625070).

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

817679442 is a wasteful number, since it uses less digits than its factorization.

817679442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282.

The product of its digits is 677376, while the sum is 48.

The square root of 817679442 is about 28595.0947191997. The cubic root of 817679442 is about 935.1063933760.

The spelling of 817679442 in words is "eight hundred seventeen million, six hundred seventy-nine thousand, four hundred forty-two".