684279638 has 16 divisors (see below), whose sum is σ = 1174020000. Its totient is φ = 293020416.

The previous prime is 684279637. The next prime is 684279641. The reversal of 684279638 is 836972486.

It is a super-2 number, since 2×684279638² = 936477245962822088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 684279638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684279637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2081 + ... + 37052.

It is an arithmetic number, because the mean of its divisors is an integer number (73376250).

Almost surely, 2^684279638 is an apocalyptic number.

684279638 is a deficient number, since it is larger than the sum of its proper divisors (489740362).

684279638 is a wasteful number, since it uses less digits than its factorization.

684279638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40391.

The product of its digits is 3483648, while the sum is 53.

The square root of 684279638 is about 26158.7392280286. The cubic root of 684279638 is about 881.2068659672.

The spelling of 684279638 in words is "six hundred eighty-four million, two hundred seventy-nine thousand, six hundred thirty-eight".