690279889 has 8 divisors (see below), whose sum is σ = 743800680. Its totient is φ = 636819456.

The previous prime is 690279853. The next prime is 690279893. The reversal of 690279889 is 988972096.

It can be written as a sum of positive squares in 4 ways, for example, as 179158225 + 511121664 = 13385^2 + 22608^2 .

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

It is not a de Polignac number, because 690279889 - 2¹⁷ = 690148817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690279809) 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, 10257 + ... + 38545.

It is an arithmetic number, because the mean of its divisors is an integer number (92975085).

Almost surely, 2^690279889 is an apocalyptic number.

It is an amenable number.

690279889 is a deficient number, since it is larger than the sum of its proper divisors (53520791).

690279889 is a wasteful number, since it uses less digits than its factorization.

690279889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30179.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The square root of 690279889 is about 26273.1781290349. The cubic root of 690279889 is about 883.7750569970.

The spelling of 690279889 in words is "six hundred ninety million, two hundred seventy-nine thousand, eight hundred eighty-nine".