686564880 has 40 divisors (see below), whose sum is σ = 2128351872. Its totient is φ = 183083904.

The previous prime is 686564869. The next prime is 686564891. The reversal of 686564880 is 88465686.

It is an interprime number because it is at equal distance from previous prime (686564869) and next prime (686564891).

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1430104 + ... + 1430583.

Almost surely, 2^686564880 is an apocalyptic number.

686564880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686564880 is an abundant number, since it is smaller than the sum of its proper divisors (1441786992).

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

686564880 is a wasteful number, since it uses less digits than its factorization.

686564880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860703 (or 2860697 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The square root of 686564880 is about 26202.3830977261. The cubic root of 686564880 is about 882.1867447711.

It can be divided in two parts, 68656 and 4880, that added together give a triangular number (73536 = T₃₈₃).

The spelling of 686564880 in words is "six hundred eighty-six million, five hundred sixty-four thousand, eight hundred eighty".