690879 has 16 divisors (see below), whose sum is σ = 1064448. Its totient is φ = 390432.

The previous prime is 690871. The next prime is 690887. The reversal of 690879 is 978096.

690879 = 2² + 3² + ... + 127².

It is an interprime number because it is at equal distance from previous prime (690871) and next prime (690887).

It is not a de Polignac number, because 690879 - 2³ = 690871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690871) 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, 3409 + ... + 3605.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2⁶⁹⁰⁸⁷⁹ is an apocalyptic number.

690879 is a deficient number, since it is larger than the sum of its proper divisors (373569).

690879 is a wasteful number, since it uses less digits than its factorization.

690879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 690879 is about 831.1913137178. The cubic root of 690879 is about 88.4030666476.

It can be divided in two parts, 69087 and 9, that added together give a palindrome (69096).

The spelling of 690879 in words is "six hundred ninety thousand, eight hundred seventy-nine".