685524240 has 60 divisors (see below), whose sum is σ = 2302221324. Its totient is φ = 182806272.

The previous prime is 685524193. The next prime is 685524251. The reversal of 685524240 is 42425586.

It is a happy number.

685524240 is a `hidden beast` number, since 68 + 552 + 4 + 2 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 281031696 + 404492544 = 16764^2 + 20112^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a junction number, because it is equal to n+sod(n) for n = 685524195 and 685524204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 475339 + ... + 476778.

Almost surely, 2^685524240 is an apocalyptic number.

685524240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685524240 is an abundant number, since it is smaller than the sum of its proper divisors (1616697084).

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

685524240 is a wasteful number, since it uses less digits than its factorization.

685524240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952136 (or 952127 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 685524240 is about 26182.5178315608. The cubic root of 685524240 is about 881.7408034082.

The spelling of 685524240 in words is "six hundred eighty-five million, five hundred twenty-four thousand, two hundred forty".