684284979 has 32 divisors (see below), whose sum is σ = 1078460416. Its totient is φ = 377667360.

The previous prime is 684284933. The next prime is 684284987. The reversal of 684284979 is 979482486.

It is not a de Polignac number, because 684284979 - 2¹⁶ = 684219443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684284779) 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, 628974 + ... + 630060.

It is an arithmetic number, because the mean of its divisors is an integer number (33701888).

Almost surely, 2^684284979 is an apocalyptic number.

684284979 is a deficient number, since it is larger than the sum of its proper divisors (394175437).

684284979 is a wasteful number, since it uses less digits than its factorization.

684284979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095.

The product of its digits is 6967296, while the sum is 57.

The square root of 684284979 is about 26158.8413160828. The cubic root of 684284979 is about 881.2091586525.

The spelling of 684284979 in words is "six hundred eighty-four million, two hundred eighty-four thousand, nine hundred seventy-nine".