687979942 has 16 divisors (see below), whose sum is σ = 1112600160. Its totient is φ = 317172672.

The previous prime is 687979927. The next prime is 687979973. The reversal of 687979942 is 249979786.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9498 + ... + 38290.

It is an arithmetic number, because the mean of its divisors is an integer number (69537510).

Almost surely, 2^687979942 is an apocalyptic number.

687979942 is a deficient number, since it is larger than the sum of its proper divisors (424620218).

687979942 is a wasteful number, since it uses less digits than its factorization.

687979942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29727.

The product of its digits is 13716864, while the sum is 61.

The square root of 687979942 is about 26229.3717423807. The cubic root of 687979942 is about 882.7924133245.

The spelling of 687979942 in words is "six hundred eighty-seven million, nine hundred seventy-nine thousand, nine hundred forty-two".