690284891 has 4 divisors (see below), whose sum is σ = 706338072. Its totient is φ = 674231712.

The previous prime is 690284863. The next prime is 690284899. The reversal of 690284891 is 198482096.

690284891 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 690284891 - 2²⁶ = 623176027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690284899) 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, 8026526 + ... + 8026611.

It is an arithmetic number, because the mean of its divisors is an integer number (176584518).

Almost surely, 2^690284891 is an apocalyptic number.

690284891 is a deficient number, since it is larger than the sum of its proper divisors (16053181).

690284891 is a wasteful number, since it uses less digits than its factorization.

690284891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16053180.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 690284891 is about 26273.2733210006. The cubic root of 690284891 is about 883.7771917022. Note that the first 3 decimals are identical.

The spelling of 690284891 in words is "six hundred ninety million, two hundred eighty-four thousand, eight hundred ninety-one".