425720689 has 9 divisors (see below), whose sum is σ = 435964377. Its totient is φ = 415713684.

The previous prime is 425720677. The next prime is 425720693. The reversal of 425720689 is 986027524.

The square root of 425720689 is 20633.

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

It is not a de Polignac number, because 425720689 - 2⁵ = 425720657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (425720699) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 969532 + ... + 969970.

Almost surely, 2^425720689 is an apocalyptic number.

425720689 is the 20633-rd square number.

425720689 is the 10317-th centered octagonal number.

It is an amenable number.

425720689 is a deficient number, since it is larger than the sum of its proper divisors (10243688).

425720689 is an frugal number, since it uses more digits than its factorization.

425720689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The cubic root of 425720689 is about 752.2720369951.

It can be divided in two parts, 425720 and 689, that added together give a square (426409 = 653²).

The spelling of 425720689 in words is "four hundred twenty-five million, seven hundred twenty thousand, six hundred eighty-nine".