690455899 has 4 divisors (see below), whose sum is σ = 789092464. Its totient is φ = 591819336.

The previous prime is 690455893. The next prime is 690455917. The reversal of 690455899 is 998554096.

It is a happy number.

690455899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690455899 - 2⁹ = 690455387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690455893) 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, 49318272 + ... + 49318285.

It is an arithmetic number, because the mean of its divisors is an integer number (197273116).

Almost surely, 2^690455899 is an apocalyptic number.

690455899 is a deficient number, since it is larger than the sum of its proper divisors (98636565).

690455899 is an equidigital number, since it uses as much as digits as its factorization.

690455899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98636564.

The product of its (nonzero) digits is 3499200, while the sum is 55.

The square root of 690455899 is about 26276.5275293369. The cubic root of 690455899 is about 883.8501666402.

The spelling of 690455899 in words is "six hundred ninety million, four hundred fifty-five thousand, eight hundred ninety-nine".