685802538 has 20 divisors (see below), whose sum is σ = 1536706050. Its totient is φ = 228600792.

The previous prime is 685802519. The next prime is 685802543. The reversal of 685802538 is 835208586.

It is a happy number.

685802538 is a `hidden beast` number, since 68 + 58 + 0 + 2 + 538 = 666.

It can be written as a sum of positive squares in only one way, i.e., 665794809 + 20007729 = 25803^2 + 4473^2 .

It is a super-2 number, since 2×685802538² = 940650242254482888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 685802493 and 685802502.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2116513 + ... + 2116836.

Almost surely, 2^685802538 is an apocalyptic number.

685802538 is an abundant number, since it is smaller than the sum of its proper divisors (850903512).

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

685802538 is a wasteful number, since it uses less digits than its factorization.

685802538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4233363 (or 4233354 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 685802538 is about 26187.8318690189. The cubic root of 685802538 is about 881.8601055370.

The spelling of 685802538 in words is "six hundred eighty-five million, eight hundred two thousand, five hundred thirty-eight".