56778671 has 2 divisors, whose sum is σ = 56778672. Its totient is φ = 56778670.

The previous prime is 56778661. The next prime is 56778677. The reversal of 56778671 is 17687765.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56778671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56778677) 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 as a sum of consecutive naturals, namely, 28389335 + 28389336.

It is an arithmetic number, because the mean of its divisors is an integer number (28389336).

Almost surely, 2^56778671 is an apocalyptic number.

56778671 is a deficient number, since it is larger than the sum of its proper divisors (1).

56778671 is an equidigital number, since it uses as much as digits as its factorization.

56778671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 47.

The square root of 56778671 is about 7535.1623074755. The cubic root of 56778671 is about 384.3513471774.

The spelling of 56778671 in words is "fifty-six million, seven hundred seventy-eight thousand, six hundred seventy-one".