685487264 has 108 divisors (see below), whose sum is σ = 1726057242. Its totient is φ = 266999040.

The previous prime is 685487249. The next prime is 685487269. The reversal of 685487264 is 462784586.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 685392400 + 94864 = 26180^2 + 308^2 .

It is not an unprimeable number, because it can be changed into a prime (685487269) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 187922 + ... + 191534.

Almost surely, 2^685487264 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 685487264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863028621).

685487264 is an abundant number, since it is smaller than the sum of its proper divisors (1040569978).

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

685487264 is a wasteful number, since it uses less digits than its factorization.

685487264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3659 (or 3633 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 50.

The square root of 685487264 is about 26181.8117020194. The cubic root of 685487264 is about 881.7249499283.

The spelling of 685487264 in words is "six hundred eighty-five million, four hundred eighty-seven thousand, two hundred sixty-four".