687959994 has 16 divisors (see below), whose sum is σ = 1381828032. Its totient is φ = 228335328.

The previous prime is 687959989. The next prime is 687960023. The reversal of 687959994 is 499959786.

687959994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×687959994⁴ (a number of 36 digits) contains 4444 as substring.

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, 244654 + ... + 247449.

It is an arithmetic number, because the mean of its divisors is an integer number (86364252).

Almost surely, 2^687959994 is an apocalyptic number.

687959994 is an abundant number, since it is smaller than the sum of its proper divisors (693868038).

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

687959994 is a wasteful number, since it uses less digits than its factorization.

687959994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492341.

The product of its digits is 44089920, while the sum is 66.

The square root of 687959994 is about 26228.9914788960. The cubic root of 687959994 is about 882.7838810441.

The spelling of 687959994 in words is "six hundred eighty-seven million, nine hundred fifty-nine thousand, nine hundred ninety-four".