684880287 has 32 divisors (see below), whose sum is σ = 1147840512. Its totient is φ = 353562624.

The previous prime is 684880283. The next prime is 684880291. The reversal of 684880287 is 782088486.

It is an interprime number because it is at equal distance from previous prime (684880283) and next prime (684880291).

It is not a de Polignac number, because 684880287 - 2² = 684880283 is a prime.

It is a super-2 number, since 2×684880287² = 938122015042404738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684880283) 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, 13858 + ... + 39519.

It is an arithmetic number, because the mean of its divisors is an integer number (35870016).

Almost surely, 2^684880287 is an apocalyptic number.

684880287 is a deficient number, since it is larger than the sum of its proper divisors (462960225).

684880287 is a wasteful number, since it uses less digits than its factorization.

684880287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53447.

The product of its (nonzero) digits is 1376256, while the sum is 51.

The square root of 684880287 is about 26170.2175573685. The cubic root of 684880287 is about 881.4646266837.

The spelling of 684880287 in words is "six hundred eighty-four million, eight hundred eighty thousand, two hundred eighty-seven".