690564818 has 8 divisors (see below), whose sum is σ = 1063843212. Its totient is φ = 335950416.

The previous prime is 690564817. The next prime is 690564841. The reversal of 690564818 is 818465096.

It can be written as a sum of positive squares in 2 ways, for example, as 472323289 + 218241529 = 21733^2 + 14773^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (690564817) 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, 4665905 + ... + 4666052.

Almost surely, 2^690564818 is an apocalyptic number.

690564818 is a deficient number, since it is larger than the sum of its proper divisors (373278394).

690564818 is a wasteful number, since it uses less digits than its factorization.

690564818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331996.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 690564818 is about 26278.6000007611. The cubic root of 690564818 is about 883.8966398061.

The spelling of 690564818 in words is "six hundred ninety million, five hundred sixty-four thousand, eight hundred eighteen".