684574491 has 16 divisors (see below), whose sum is σ = 934940160. Its totient is φ = 445317600.

The previous prime is 684574489. The next prime is 684574511. The reversal of 684574491 is 194475486.

It is not a de Polignac number, because 684574491 - 2¹ = 684574489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684574491.

It is not an unprimeable number, because it can be changed into a prime (684574441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165790 + ... + 169868.

It is an arithmetic number, because the mean of its divisors is an integer number (58433760).

Almost surely, 2^684574491 is an apocalyptic number.

684574491 is a deficient number, since it is larger than the sum of its proper divisors (250365669).

684574491 is a wasteful number, since it uses less digits than its factorization.

684574491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426.

The product of its digits is 967680, while the sum is 48.

The square root of 684574491 is about 26164.3744622339. The cubic root of 684574491 is about 881.3334171427. Note that the first 3 decimals are identical.

The spelling of 684574491 in words is "six hundred eighty-four million, five hundred seventy-four thousand, four hundred ninety-one".