685029024 has 72 divisors (see below), whose sum is σ = 1980037332. Its totient is φ = 224593920.

The previous prime is 685028977. The next prime is 685029053. The reversal of 685029024 is 420920586.

It is a happy number.

685029024 is a `hidden beast` number, since 68 + 502 + 90 + 2 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 569681424 + 115347600 = 23868^2 + 10740^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 685029024.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1929 + ... + 37064.

Almost surely, 2^685029024 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 685029024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990018666).

685029024 is an abundant number, since it is smaller than the sum of its proper divisors (1295008308).

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

685029024 is a wasteful number, since it uses less digits than its factorization.

685029024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39070 (or 39059 counting only the distinct ones).

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

The square root of 685029024 is about 26173.0591257499. The cubic root of 685029024 is about 881.5284319534.

The spelling of 685029024 in words is "six hundred eighty-five million, twenty-nine thousand, twenty-four".