684260880 has 80 divisors (see below), whose sum is σ = 2245999104. Its totient is φ = 171735040.

The previous prime is 684260839. The next prime is 684260891. The reversal of 684260880 is 88062486.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79776 + ... + 87935.

Almost surely, 2^684260880 is an apocalyptic number.

684260880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684260880 is an abundant number, since it is smaller than the sum of its proper divisors (1561738224).

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

684260880 is a wasteful number, since it uses less digits than its factorization.

684260880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167744 (or 167738 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 42.

The square root of 684260880 is about 26158.3806838267. The cubic root of 684260880 is about 881.1988137867.

The spelling of 684260880 in words is "six hundred eighty-four million, two hundred sixty thousand, eight hundred eighty".