689490245 has 6 divisors (see below), whose sum is σ = 827458758. Its totient is φ = 551545224.

The previous prime is 689490229. The next prime is 689490253. The reversal of 689490245 is 542094986.

It can be written as a sum of positive squares in only one way, i.e., 551592196 + 137898049 = 23486^2 + 11743^2 .

It is not a de Polignac number, because 689490245 - 2⁴ = 689490229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689490245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52844 + ... + 64586.

It is an arithmetic number, because the mean of its divisors is an integer number (137909793).

Almost surely, 2^689490245 is an apocalyptic number.

It is an amenable number.

689490245 is a deficient number, since it is larger than the sum of its proper divisors (137968513).

689490245 is an frugal number, since it uses more digits than its factorization.

689490245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23491 (or 11748 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 689490245 is about 26258.1462597800. The cubic root of 689490245 is about 883.4379309705.

The spelling of 689490245 in words is "six hundred eighty-nine million, four hundred ninety thousand, two hundred forty-five".