56726389 has 2 divisors, whose sum is σ = 56726390. Its totient is φ = 56726388.

The previous prime is 56726387. The next prime is 56726429. The reversal of 56726389 is 98362765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40259025 + 16467364 = 6345^2 + 4058^2 .

It is a cyclic number.

It is not a de Polignac number, because 56726389 - 2¹ = 56726387 is a prime.

Together with 56726387, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56726387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28363194 + 28363195.

It is an arithmetic number, because the mean of its divisors is an integer number (28363195).

Almost surely, 2^56726389 is an apocalyptic number.

It is an amenable number.

56726389 is a deficient number, since it is larger than the sum of its proper divisors (1).

56726389 is an equidigital number, since it uses as much as digits as its factorization.

56726389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The square root of 56726389 is about 7531.6923065139. The cubic root of 56726389 is about 384.2333402587.

The spelling of 56726389 in words is "fifty-six million, seven hundred twenty-six thousand, three hundred eighty-nine".