690684653 has 4 divisors (see below), whose sum is σ = 731313180. Its totient is φ = 650056128.

The previous prime is 690684649. The next prime is 690684667. The reversal of 690684653 is 356486096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 572788489 + 117896164 = 23933^2 + 10858^2 .

It is a cyclic number.

It is not a de Polignac number, because 690684653 - 2² = 690684649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 690684598 and 690684607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690684053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20314238 + ... + 20314271.

It is an arithmetic number, because the mean of its divisors is an integer number (182828295).

Almost surely, 2^690684653 is an apocalyptic number.

It is an amenable number.

690684653 is a deficient number, since it is larger than the sum of its proper divisors (40628527).

690684653 is a wasteful number, since it uses less digits than its factorization.

690684653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40628526.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 690684653 is about 26280.8799890719. The cubic root of 690684653 is about 883.9477649260.

The spelling of 690684653 in words is "six hundred ninety million, six hundred eighty-four thousand, six hundred fifty-three".