690889581 has 24 divisors (see below), whose sum is σ = 1045617664. Its totient is φ = 455829120.

The previous prime is 690889553. The next prime is 690889603. The reversal of 690889581 is 185988096.

690889581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 690889581 - 2⁶ = 690889517 is a prime.

It is a super-2 number, since 2×690889581² = 954656826268711122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690889531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8916 + ... + 38226.

Almost surely, 2^690889581 is an apocalyptic number.

It is an amenable number.

690889581 is a deficient number, since it is larger than the sum of its proper divisors (354728083).

690889581 is an equidigital number, since it uses as much as digits as its factorization.

690889581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29423 (or 29411 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The square root of 690889581 is about 26284.7785039174. The cubic root of 690889581 is about 884.0351795101.

The spelling of 690889581 in words is "six hundred ninety million, eight hundred eighty-nine thousand, five hundred eighty-one".