689430049 has 45 divisors (see below), whose sum is σ = 911559105. Its totient is φ = 519888600.

The previous prime is 689430043. The next prime is 689430061. The reversal of 689430049 is 940034986.

The square root of 689430049 is 26257.

It is a perfect power (a square), and thus also a powerful number.

689430049 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 689430049 - 2¹¹ = 689428001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689429987 and 689430014.

It is not an unprimeable number, because it can be changed into a prime (689430043) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 22239664 + ... + 22239694.

It is an arithmetic number, because the mean of its divisors is an integer number (20256869).

Almost surely, 2^689430049 is an apocalyptic number.

689430049 is the 26257-th square number.

689430049 is the 13129-th centered octagonal number.

It is an amenable number.

689430049 is a deficient number, since it is larger than the sum of its proper divisors (222129056).

689430049 is an frugal number, since it uses more digits than its factorization.

689430049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The cubic root of 689430049 is about 883.4122206830.

Multiplying 689430049 by its product of nonzero digits (186624), we get a square (128664193464576 = 11343024²).

The spelling of 689430049 in words is "six hundred eighty-nine million, four hundred thirty thousand, forty-nine".