685870988 has 48 divisors (see below), whose sum is σ = 1336849920. Its totient is φ = 305265600.

The previous prime is 685870981. The next prime is 685871023. The reversal of 685870988 is 889078586.

It is a super-2 number, since 2×685870988² = 940838024360192288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (685870981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1118570 + ... + 1119182.

It is an arithmetic number, because the mean of its divisors is an integer number (27851040).

Almost surely, 2^685870988 is an apocalyptic number.

It is an amenable number.

685870988 is a deficient number, since it is larger than the sum of its proper divisors (650978932).

685870988 is a wasteful number, since it uses less digits than its factorization.

685870988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1118 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 59.

The square root of 685870988 is about 26189.1387410888. The cubic root of 685870988 is about 881.8894440675.

The spelling of 685870988 in words is "six hundred eighty-five million, eight hundred seventy thousand, nine hundred eighty-eight".