56128739 has 2 divisors, whose sum is σ = 56128740. Its totient is φ = 56128738.

The previous prime is 56128727. The next prime is 56128757. The reversal of 56128739 is 93782165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56128739 - 2²⁰ = 55080163 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56128696 and 56128705.

It is not a weakly prime, because it can be changed into another prime (56128799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28064369 + 28064370.

It is an arithmetic number, because the mean of its divisors is an integer number (28064370).

Almost surely, 2^56128739 is an apocalyptic number.

56128739 is a deficient number, since it is larger than the sum of its proper divisors (1).

56128739 is an equidigital number, since it uses as much as digits as its factorization.

56128739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 56128739 is about 7491.9115718220. The cubic root of 56128739 is about 382.8791893777.

The spelling of 56128739 in words is "fifty-six million, one hundred twenty-eight thousand, seven hundred thirty-nine".