687900490 has 16 divisors (see below), whose sum is σ = 1238755680. Its totient is φ = 275041360.

The previous prime is 687900487. The next prime is 687900511. The reversal of 687900490 is 94009786.

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, 11721 + ... + 38899.

It is an arithmetic number, because the mean of its divisors is an integer number (77422230).

Almost surely, 2^687900490 is an apocalyptic number.

687900490 is a deficient number, since it is larger than the sum of its proper divisors (550855190).

687900490 is a wasteful number, since it uses less digits than its factorization.

687900490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29717.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 687900490 is about 26227.8571370213. The cubic root of 687900490 is about 882.7584286500.

The spelling of 687900490 in words is "six hundred eighty-seven million, nine hundred thousand, four hundred ninety".