687398223123 has 32 divisors (see below), whose sum is σ = 1045845734400. Its totient is φ = 446009334048.

The previous prime is 687398223097. The next prime is 687398223163. The reversal of 687398223123 is 321322893786.

687398223123 is a `hidden beast` number, since 6 + 8 + 7 + 398 + 223 + 1 + 23 = 666.

It is not a de Polignac number, because 687398223123 - 2⁵ = 687398223091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687398223123.

It is not an unprimeable number, because it can be changed into a prime (687398223163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1285936 + ... + 1740237.

It is an arithmetic number, because the mean of its divisors is an integer number (32682679200).

Almost surely, 2^687398223123 is an apocalyptic number.

687398223123 is a deficient number, since it is larger than the sum of its proper divisors (358447511277).

687398223123 is a wasteful number, since it uses less digits than its factorization.

687398223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026408 (or 3026402 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 687398223123 in words is "six hundred eighty-seven billion, three hundred ninety-eight million, two hundred twenty-three thousand, one hundred twenty-three".