56739989 has 2 divisors, whose sum is σ = 56739990. Its totient is φ = 56739988.

The previous prime is 56739983. The next prime is 56740003. The reversal of 56739989 is 98993765.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56400100 + 339889 = 7510^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 56739989 - 2⁴ = 56739973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56739983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28369994 + 28369995.

It is an arithmetic number, because the mean of its divisors is an integer number (28369995).

Almost surely, 2^56739989 is an apocalyptic number.

It is an amenable number.

56739989 is a deficient number, since it is larger than the sum of its proper divisors (1).

56739989 is an equidigital number, since it uses as much as digits as its factorization.

56739989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The square root of 56739989 is about 7532.5951039466. The cubic root of 56739989 is about 384.2640441103.

The spelling of 56739989 in words is "fifty-six million, seven hundred thirty-nine thousand, nine hundred eighty-nine".