689830491 has 16 divisors (see below), whose sum is σ = 1051550208. Its totient is φ = 394046400.

The previous prime is 689830487. The next prime is 689830501. The reversal of 689830491 is 194038986.

It is not a de Polignac number, because 689830491 - 2² = 689830487 is a prime.

It is a super-2 number, since 2×689830491² = 951732212626602162, 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 689830491.

It is not an unprimeable number, because it can be changed into a prime (689830441) 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, 88471 + ... + 95951.

It is an arithmetic number, because the mean of its divisors is an integer number (65721888).

Almost surely, 2^689830491 is an apocalyptic number.

689830491 is a deficient number, since it is larger than the sum of its proper divisors (361719717).

689830491 is a wasteful number, since it uses less digits than its factorization.

689830491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11882.

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 689830491 is about 26264.6243262682. The cubic root of 689830491 is about 883.5832251663.

The spelling of 689830491 in words is "six hundred eighty-nine million, eight hundred thirty thousand, four hundred ninety-one".