690593 has 6 divisors (see below), whose sum is σ = 729234. Its totient is φ = 653904.

The previous prime is 690589. The next prime is 690607. The reversal of 690593 is 395096.

It can be written as a sum of positive squares in only one way, i.e., 667489 + 23104 = 817^2 + 152^2 .

It is not a de Polignac number, because 690593 - 2² = 690589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (690533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596 + ... + 1317.

It is an arithmetic number, because the mean of its divisors is an integer number (121539).

2⁶⁹⁰⁵⁹³ is an apocalyptic number.

It is an amenable number.

690593 is a deficient number, since it is larger than the sum of its proper divisors (38641).

690593 is a wasteful number, since it uses less digits than its factorization.

690593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951 (or 1932 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 690593 is about 831.0192536879. The cubic root of 690593 is about 88.3908663604.

Subtracting from 690593 its sum of digits (32), we obtain a square (690561 = 831²).

The spelling of 690593 in words is "six hundred ninety thousand, five hundred ninety-three".