690257 has 4 divisors (see below), whose sum is σ = 696816. Its totient is φ = 683700.

The previous prime is 690233. The next prime is 690259. The reversal of 690257 is 752096.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690257 - 2¹⁰ = 689233 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (690259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3119 + ... + 3332.

It is an arithmetic number, because the mean of its divisors is an integer number (174204).

2⁶⁹⁰²⁵⁷ is an apocalyptic number.

It is an amenable number.

690257 is a deficient number, since it is larger than the sum of its proper divisors (6559).

690257 is a wasteful number, since it uses less digits than its factorization.

690257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6558.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 690257 is about 830.8170677111. The cubic root of 690257 is about 88.3765288519.

The spelling of 690257 in words is "six hundred ninety thousand, two hundred fifty-seven".