687718974 has 16 divisors (see below), whose sum is σ = 1375733520. Its totient is φ = 229190400.

The previous prime is 687718961. The next prime is 687718987. The reversal of 687718974 is 479817786.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (687718961) and next prime (687718987).

It is a super-2 number, since 2×687718974² = 945914774399225352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28174 + ... + 46574.

It is an arithmetic number, because the mean of its divisors is an integer number (85983345).

Almost surely, 2^687718974 is an apocalyptic number.

687718974 is an abundant number, since it is smaller than the sum of its proper divisors (688014546).

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

687718974 is a wasteful number, since it uses less digits than its factorization.

687718974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24635.

The product of its digits is 4741632, while the sum is 57.

The square root of 687718974 is about 26224.3965421514. The cubic root of 687718974 is about 882.6807774602.

The spelling of 687718974 in words is "six hundred eighty-seven million, seven hundred eighteen thousand, nine hundred seventy-four".