684228931 has 12 divisors (see below), whose sum is σ = 745443264. Its totient is φ = 627296400.

The previous prime is 684228913. The next prime is 684228973. The reversal of 684228931 is 139822486.

It is not a de Polignac number, because 684228931 - 2⁷ = 684228803 is a prime.

It is a super-2 number, since 2×684228931² = 936338460034805522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684228331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19380 + ... + 41761.

It is an arithmetic number, because the mean of its divisors is an integer number (62120272).

Almost surely, 2^684228931 is an apocalyptic number.

684228931 is a deficient number, since it is larger than the sum of its proper divisors (61214333).

684228931 is a wasteful number, since it uses less digits than its factorization.

684228931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61210 (or 61191 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 684228931 is about 26157.7699928721. The cubic root of 684228931 is about 881.1850988134.

The spelling of 684228931 in words is "six hundred eighty-four million, two hundred twenty-eight thousand, nine hundred thirty-one".