56778899 has 2 divisors, whose sum is σ = 56778900. Its totient is φ = 56778898.

The previous prime is 56778851. The next prime is 56778901. The reversal of 56778899 is 99887765.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56778899 - 2¹² = 56774803 is a prime.

Together with 56778901, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (56778199) 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, 28389449 + 28389450.

It is an arithmetic number, because the mean of its divisors is an integer number (28389450).

Almost surely, 2^56778899 is an apocalyptic number.

56778899 is a deficient number, since it is larger than the sum of its proper divisors (1).

56778899 is an equidigital number, since it uses as much as digits as its factorization.

56778899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 59.

The square root of 56778899 is about 7535.1774365306. The cubic root of 56778899 is about 384.3518616428.

The spelling of 56778899 in words is "fifty-six million, seven hundred seventy-eight thousand, eight hundred ninety-nine".