56378881 has 4 divisors (see below), whose sum is σ = 60715732. Its totient is φ = 52042032.

The previous prime is 56378831. The next prime is 56378887. The reversal of 56378881 is 18887365.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10342656 + 46036225 = 3216^2 + 6785^2 .

It is a cyclic number.

It is not a de Polignac number, because 56378881 - 2⁷ = 56378753 is a prime.

It is a super-2 number, since 2×56378881² = 6357156445624322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56378887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2168406 + ... + 2168431.

It is an arithmetic number, because the mean of its divisors is an integer number (15178933).

Almost surely, 2^56378881 is an apocalyptic number.

It is an amenable number.

56378881 is a deficient number, since it is larger than the sum of its proper divisors (4336851).

56378881 is a wasteful number, since it uses less digits than its factorization.

56378881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336850.

The product of its digits is 322560, while the sum is 46.

The square root of 56378881 is about 7508.5871507228. The cubic root of 56378881 is about 383.4471232867.

The spelling of 56378881 in words is "fifty-six million, three hundred seventy-eight thousand, eight hundred eighty-one".