685777536 has 256 divisors, whose sum is σ = 2158156800. Its totient is φ = 213995520.

The previous prime is 685777511. The next prime is 685777553. The reversal of 685777536 is 635777586.

685777536 is a `hidden beast` number, since 68 + 577 + 7 + 5 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3963946 + ... + 3964118.

It is an arithmetic number, because the mean of its divisors is an integer number (8430300).

Almost surely, 2^685777536 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 685777536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1079078400).

685777536 is an abundant number, since it is smaller than the sum of its proper divisors (1472379264).

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

685777536 is a wasteful number, since it uses less digits than its factorization.

685777536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 246 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 54.

The square root of 685777536 is about 26187.3545055624. The cubic root of 685777536 is about 881.8493888787.

The spelling of 685777536 in words is "six hundred eighty-five million, seven hundred seventy-seven thousand, five hundred thirty-six".