685511540 has 48 divisors (see below), whose sum is σ = 1676287872. Its totient is φ = 230595456.

The previous prime is 685511531. The next prime is 685511551. The reversal of 685511540 is 45115586.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 685511540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38774 + ... + 53613.

It is an arithmetic number, because the mean of its divisors is an integer number (34922664).

Almost surely, 2^685511540 is an apocalyptic number.

It is an amenable number.

685511540 is an abundant number, since it is smaller than the sum of its proper divisors (990776332).

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

685511540 is a wasteful number, since it uses less digits than its factorization.

685511540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92456 (or 92454 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 685511540 is about 26182.2753021963. The cubic root of 685511540 is about 881.7353583406.

The spelling of 685511540 in words is "six hundred eighty-five million, five hundred eleven thousand, five hundred forty".