685910880144 has 640 divisors, whose sum is σ = 2479384166400. Its totient is φ = 177038991360.

The previous prime is 685910880119. The next prime is 685910880169. The reversal of 685910880144 is 441088019586.

It is a happy number.

685910880144 is a `hidden beast` number, since 6 + 8 + 591 + 0 + 8 + 8 + 0 + 1 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (685910880119) and next prime (685910880169).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 202391602 + ... + 202394990.

It is an arithmetic number, because the mean of its divisors is an integer number (3874037760).

Almost surely, 2^685910880144 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 685910880144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239692083200).

685910880144 is an abundant number, since it is smaller than the sum of its proper divisors (1793473286256).

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

685910880144 is a wasteful number, since it uses less digits than its factorization.

685910880144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588 (or 3576 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 54.

The spelling of 685910880144 in words is "six hundred eighty-five billion, nine hundred ten million, eight hundred eighty thousand, one hundred forty-four".