685142136 has 96 divisors (see below), whose sum is σ = 2126373600. Its totient is φ = 195229440.

The previous prime is 685142113. The next prime is 685142141. The reversal of 685142136 is 631241586.

It is a happy number.

685142136 is a `hidden beast` number, since 6 + 8 + 514 + 2 + 136 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 685142136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210570 + ... + 213798.

It is an arithmetic number, because the mean of its divisors is an integer number (22149725).

Almost surely, 2^685142136 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 685142136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1063186800).

685142136 is an abundant number, since it is smaller than the sum of its proper divisors (1441231464).

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

685142136 is a wasteful number, since it uses less digits than its factorization.

685142136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3669 (or 3662 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 685142136 is about 26175.2198844632. The cubic root of 685142136 is about 881.5769486113.

The spelling of 685142136 in words is "six hundred eighty-five million, one hundred forty-two thousand, one hundred thirty-six".