56639389 has 4 divisors (see below), whose sum is σ = 56661724. Its totient is φ = 56617056.

The previous prime is 56639383. The next prime is 56639411. The reversal of 56639389 is 98393665.

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 28708164 + 27931225 = 5358^2 + 5285^2 .

It is a cyclic number.

It is not a de Polignac number, because 56639389 - 2⁵ = 56639357 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 (56639383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6792 + ... + 12625.

It is an arithmetic number, because the mean of its divisors is an integer number (14165431).

Almost surely, 2^56639389 is an apocalyptic number.

It is an amenable number.

56639389 is a deficient number, since it is larger than the sum of its proper divisors (22335).

56639389 is a wasteful number, since it uses less digits than its factorization.

56639389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22334.

The product of its digits is 1049760, while the sum is 49.

The square root of 56639389 is about 7525.9144959267. The cubic root of 56639389 is about 384.0368097128.

The spelling of 56639389 in words is "fifty-six million, six hundred thirty-nine thousand, three hundred eighty-nine".