56778889 has 8 divisors (see below), whose sum is σ = 58256352. Its totient is φ = 55320480.

The previous prime is 56778851. The next prime is 56778899. The reversal of 56778889 is 98887765.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56778889 - 2⁹ = 56778377 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (56778899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1374 + ... + 10744.

It is an arithmetic number, because the mean of its divisors is an integer number (7282044).

Almost surely, 2^56778889 is an apocalyptic number.

It is an amenable number.

56778889 is a deficient number, since it is larger than the sum of its proper divisors (1477463).

56778889 is an equidigital number, since it uses as much as digits as its factorization.

56778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9527.

The product of its digits is 6773760, while the sum is 58.

The square root of 56778889 is about 7535.1767729762. The cubic root of 56778889 is about 384.3518390786.

The spelling of 56778889 in words is "fifty-six million, seven hundred seventy-eight thousand, eight hundred eighty-nine".