690810052 has 12 divisors (see below), whose sum is σ = 1209364156. Its totient is φ = 345277440.

The previous prime is 690810047. The next prime is 690810061. The reversal of 690810052 is 250018096.

It can be written as a sum of positive squares in 2 ways, for example, as 90364036 + 600446016 = 9506^2 + 24504^2 .

It is a junction number, because it is equal to n+sod(n) for n = 690809996 and 690810023.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19149 + ... + 41812.

Almost surely, 2^690810052 is an apocalyptic number.

It is an amenable number.

690810052 is a deficient number, since it is larger than the sum of its proper divisors (518554104).

690810052 is a wasteful number, since it uses less digits than its factorization.

690810052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63798 (or 63796 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 690810052 is about 26283.2656266302. The cubic root of 690810052 is about 884.0012574800.

The spelling of 690810052 in words is "six hundred ninety million, eight hundred ten thousand, fifty-two".