690625 has 24 divisors (see below), whose sum is σ = 984312. Its totient is φ = 480000.

The previous prime is 690611. The next prime is 690629. The reversal of 690625 is 526096.

It can be written as a sum of positive squares in 12 ways, for example, as 690561 + 64 = 831^2 + 8^2 .

It is a de Polignac number, because none of the positive numbers 2^k-690625 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690593 and 690602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40617 + ... + 40633.

It is an arithmetic number, because the mean of its divisors is an integer number (41013).

2⁶⁹⁰⁶²⁵ is an apocalyptic number.

690625 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

690625 is a deficient number, since it is larger than the sum of its proper divisors (293687).

690625 is an equidigital number, since it uses as much as digits as its factorization.

690625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 690625 is about 831.0385069297. The cubic root of 690625 is about 88.3922315949.

The spelling of 690625 in words is "six hundred ninety thousand, six hundred twenty-five".