817979902 has 16 divisors (see below), whose sum is σ = 1241154000. Its totient is φ = 404288640.

The previous prime is 817979893. The next prime is 817979923. The reversal of 817979902 is 209979718.

817979902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×817979902² = 1338182240151859208, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 817979902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56374 + ... + 69382.

It is an arithmetic number, because the mean of its divisors is an integer number (77572125).

Almost surely, 2^817979902 is an apocalyptic number.

817979902 is a deficient number, since it is larger than the sum of its proper divisors (423174098).

817979902 is a wasteful number, since it uses less digits than its factorization.

817979902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13371.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 817979902 is about 28600.3479349465. The cubic root of 817979902 is about 935.2209157043.

The spelling of 817979902 in words is "eight hundred seventeen million, nine hundred seventy-nine thousand, nine hundred two".