685178880 has 272 divisors, whose sum is σ = 2378152224. Its totient is φ = 167772160.

The previous prime is 685178867. The next prime is 685178927. The reversal of 685178880 is 88871586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (272).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a zygodrome in base 14.

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, 16711660 + ... + 16711700.

Almost surely, 2^685178880 is an apocalyptic number.

685178880 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 685178880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1189076112).

685178880 is an abundant number, since it is smaller than the sum of its proper divisors (1692973344).

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

685178880 is an equidigital number, since it uses as much as digits as its factorization.

685178880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 51.

The square root of 685178880 is about 26175.9217602743. The cubic root of 685178880 is about 881.5927079128.

The spelling of 685178880 in words is "six hundred eighty-five million, one hundred seventy-eight thousand, eight hundred eighty".