56778851 has 2 divisors, whose sum is σ = 56778852. Its totient is φ = 56778850.

The previous prime is 56778817. The next prime is 56778899. The reversal of 56778851 is 15887765.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56778851 - 2¹⁰ = 56777827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56778796 and 56778805.

It is not a weakly prime, because it can be changed into another prime (56778811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28389425 + 28389426.

It is an arithmetic number, because the mean of its divisors is an integer number (28389426).

Almost surely, 2^56778851 is an apocalyptic number.

56778851 is a deficient number, since it is larger than the sum of its proper divisors (1).

56778851 is an equidigital number, since it uses as much as digits as its factorization.

56778851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 47.

The square root of 56778851 is about 7535.1742514689. The cubic root of 56778851 is about 384.3517533344.

The spelling of 56778851 in words is "fifty-six million, seven hundred seventy-eight thousand, eight hundred fifty-one".