690188066 has 16 divisors (see below), whose sum is σ = 1099989720. Its totient is φ = 324789760.

The previous prime is 690188027. The next prime is 690188069. The reversal of 690188066 is 660881096.

It can be written as a sum of positive squares in 4 ways, for example, as 689325025 + 863041 = 26255^2 + 929^2 .

It is a super-3 number, since 3×690188066³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (690188069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25295 + ... + 44946.

Almost surely, 2^690188066 is an apocalyptic number.

690188066 is a deficient number, since it is larger than the sum of its proper divisors (409801654).

690188066 is an equidigital number, since it uses as much as digits as its factorization.

690188066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70294 (or 70260 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 690188066 is about 26271.4306043656. The cubic root of 690188066 is about 883.7358678328.

The spelling of 690188066 in words is "six hundred ninety million, one hundred eighty-eight thousand, sixty-six".