690261 has 16 divisors (see below), whose sum is σ = 1081920. Its totient is φ = 385920.

The previous prime is 690259. The next prime is 690269. The reversal of 690261 is 162096.

It is not a de Polignac number, because 690261 - 2¹ = 690259 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690261.

It is not an unprimeable number, because it can be changed into a prime (690269) 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, 376 + ... + 1233.

It is an arithmetic number, because the mean of its divisors is an integer number (67620).

2⁶⁹⁰²⁶¹ is an apocalyptic number.

It is an amenable number.

690261 is a deficient number, since it is larger than the sum of its proper divisors (391659).

690261 is a wasteful number, since it uses less digits than its factorization.

690261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 690261 is about 830.8194749764. The cubic root of 690261 is about 88.3766995639.

The spelling of 690261 in words is "six hundred ninety thousand, two hundred sixty-one".