687779404480 has 112 divisors (see below), whose sum is σ = 1872056825856. Its totient is φ = 235770485760.

The previous prime is 687779404463. The next prime is 687779404489. The reversal of 687779404480 is 84404977786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is not an unprimeable number, because it can be changed into a prime (687779404489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15368697 + ... + 15413383.

It is an arithmetic number, because the mean of its divisors is an integer number (16714793088).

Almost surely, 2^687779404480 is an apocalyptic number.

It is an amenable number.

687779404480 is an abundant number, since it is smaller than the sum of its proper divisors (1184277421376).

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

687779404480 is a wasteful number, since it uses less digits than its factorization.

687779404480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51582 (or 51572 counting only the distinct ones).

The product of its (nonzero) digits is 75866112, while the sum is 64.

The spelling of 687779404480 in words is "six hundred eighty-seven billion, seven hundred seventy-nine million, four hundred four thousand, four hundred eighty".