685979503100 has 72 divisors (see below), whose sum is σ = 1528695105168. Its totient is φ = 267042585600.

The previous prime is 685979503043. The next prime is 685979503189. The reversal of 685979503100 is 1305979586.

It is a super-2 number, since 2×685979503100² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 903140 + ... + 1479060.

Almost surely, 2^685979503100 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685979503100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764347552584).

685979503100 is an abundant number, since it is smaller than the sum of its proper divisors (842715602068).

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

685979503100 is a wasteful number, since it uses less digits than its factorization.

685979503100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576255 (or 576248 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 685979503100 in words is "six hundred eighty-five billion, nine hundred seventy-nine million, five hundred three thousand, one hundred".