690508937 has 6 divisors (see below), whose sum is σ = 715141518. Its totient is φ = 666697472.

The previous prime is 690508909. The next prime is 690508943. The reversal of 690508937 is 739805096.

It can be written as a sum of positive squares in 3 ways, for example, as 212693056 + 477815881 = 14584^2 + 21859^2 .

It is not a de Polignac number, because 690508937 - 2¹⁰ = 690507913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690508891 and 690508900.

It is not an unprimeable number, because it can be changed into a prime (690508237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 409688 + ... + 411369.

It is an arithmetic number, because the mean of its divisors is an integer number (119190253).

Almost surely, 2^690508937 is an apocalyptic number.

It is an amenable number.

690508937 is a deficient number, since it is larger than the sum of its proper divisors (24632581).

690508937 is an equidigital number, since it uses as much as digits as its factorization.

690508937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821115 (or 821086 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 690508937 is about 26277.5367376777. The cubic root of 690508937 is about 883.8727973131.

The spelling of 690508937 in words is "six hundred ninety million, five hundred eight thousand, nine hundred thirty-seven".