685027428 has 12 divisors (see below), whose sum is σ = 1598397360. Its totient is φ = 228342472.

The previous prime is 685027417. The next prime is 685027471. The reversal of 685027428 is 824720586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×685027428² = 938525154224590368, 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 685027428.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28542798 + ... + 28542821.

It is an arithmetic number, because the mean of its divisors is an integer number (133199780).

Almost surely, 2^685027428 is an apocalyptic number.

It is an amenable number.

685027428 is an abundant number, since it is smaller than the sum of its proper divisors (913369932).

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

685027428 is a wasteful number, since it uses less digits than its factorization.

685027428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57085626 (or 57085624 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 685027428 is about 26173.0286363653. The cubic root of 685027428 is about 881.5277473496.

The spelling of 685027428 in words is "six hundred eighty-five million, twenty-seven thousand, four hundred twenty-eight".