685692540 has 144 divisors (see below), whose sum is σ = 2323103328. Its totient is φ = 168770304.

The previous prime is 685692533. The next prime is 685692563. The reversal of 685692540 is 45296586.

685692540 is a `hidden beast` number, since 68 + 569 + 25 + 4 + 0 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57754 + ... + 68606.

It is an arithmetic number, because the mean of its divisors is an integer number (16132662).

Almost surely, 2^685692540 is an apocalyptic number.

685692540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685692540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161551664).

685692540 is an abundant number, since it is smaller than the sum of its proper divisors (1637410788).

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

685692540 is a wasteful number, since it uses less digits than its factorization.

685692540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10890 (or 10876 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The square root of 685692540 is about 26185.7316109365. The cubic root of 685692540 is about 881.8129549219.

The spelling of 685692540 in words is "six hundred eighty-five million, six hundred ninety-two thousand, five hundred forty".