685279889280 has 1024 divisors, whose sum is σ = 2887778304000. Its totient is φ = 150284574720.

The previous prime is 685279889279. The next prime is 685279889321. The reversal of 685279889280 is 82988972586.

It is a happy number.

685279889280 is a `hidden beast` number, since 6 + 8 + 527 + 9 + 8 + 8 + 92 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 685279889199 and 685279889208.

It is a congruent number.

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, 476218801 + ... + 476220239.

It is an arithmetic number, because the mean of its divisors is an integer number (2820096000).

Almost surely, 2^685279889280 is an apocalyptic number.

685279889280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685279889280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1443889152000).

685279889280 is an abundant number, since it is smaller than the sum of its proper divisors (2202498414720).

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

685279889280 is a wasteful number, since it uses less digits than its factorization.

685279889280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632 (or 1614 counting only the distinct ones).

The product of its (nonzero) digits is 278691840, while the sum is 72.

The spelling of 685279889280 in words is "six hundred eighty-five billion, two hundred seventy-nine million, eight hundred eighty-nine thousand, two hundred eighty".