685073720 has 32 divisors (see below), whose sum is σ = 1555567200. Its totient is φ = 271513728.

The previous prime is 685073713. The next prime is 685073723. The reversal of 685073720 is 27370586.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685073723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74204 + ... + 82923.

It is an arithmetic number, because the mean of its divisors is an integer number (48611475).

Almost surely, 2^685073720 is an apocalyptic number.

It is an amenable number.

685073720 is an abundant number, since it is smaller than the sum of its proper divisors (870493480).

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

685073720 is a wasteful number, since it uses less digits than its factorization.

685073720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157247 (or 157243 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 685073720 is about 26173.9129669219. The cubic root of 685073720 is about 881.5476038603.

It can be divided in two parts, 68507 and 3720, that added together give a palindrome (72227).

The spelling of 685073720 in words is "six hundred eighty-five million, seventy-three thousand, seven hundred twenty".