625638589 has 4 divisors (see below), whose sum is σ = 625808700. Its totient is φ = 625468480.

The previous prime is 625638529. The next prime is 625638599. The reversal of 625638589 is 985836526.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 252492100 + 373146489 = 15890^2 + 19317^2 .

It is a cyclic number.

It is not a de Polignac number, because 625638589 - 2¹⁵ = 625605821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625638529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79414 + ... + 86935.

It is an arithmetic number, because the mean of its divisors is an integer number (156452175).

Almost surely, 2^625638589 is an apocalyptic number.

It is an amenable number.

625638589 is a deficient number, since it is larger than the sum of its proper divisors (170111).

625638589 is a wasteful number, since it uses less digits than its factorization.

625638589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170110.

The product of its digits is 3110400, while the sum is 52.

The square root of 625638589 is about 25012.7685192983. The cubic root of 625638589 is about 855.2790667080.

The spelling of 625638589 in words is "six hundred twenty-five million, six hundred thirty-eight thousand, five hundred eighty-nine".