686403984 has 80 divisors (see below), whose sum is σ = 2091929600. Its totient is φ = 189786240.

The previous prime is 686403967. The next prime is 686403989. The reversal of 686403984 is 489304686.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (686403989) by changing a digit.

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, 22534 + ... + 43365.

It is an arithmetic number, because the mean of its divisors is an integer number (26149120).

Almost surely, 2^686403984 is an apocalyptic number.

It is an amenable number.

686403984 is an abundant number, since it is smaller than the sum of its proper divisors (1405525616).

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

686403984 is a wasteful number, since it uses less digits than its factorization.

686403984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65948 (or 65942 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 686403984 is about 26199.3126627398. The cubic root of 686403984 is about 882.1178261047.

The spelling of 686403984 in words is "six hundred eighty-six million, four hundred three thousand, nine hundred eighty-four".