56473281 has 10 divisors (see below), whose sum is σ = 84361442. Its totient is φ = 37648800.

The previous prime is 56473253. The next prime is 56473297. The reversal of 56473281 is 18237465.

56473281 is a `hidden beast` number, since 5 + 647 + 3 + 2 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 1476225 = 7416^2 + 1215^2 .

It is not a de Polignac number, because 56473281 - 2¹⁸ = 56211137 is a prime.

It is a super-2 number, since 2×56473281² = 6378462933809922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56473381) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 348520 + ... + 348681.

Almost surely, 2^56473281 is an apocalyptic number.

It is an amenable number.

56473281 is a deficient number, since it is larger than the sum of its proper divisors (27888161).

56473281 is an equidigital number, since it uses as much as digits as its factorization.

56473281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697213 (or 697204 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 56473281 is about 7514.8706575696. The cubic root of 56473281 is about 383.6610167622.

The spelling of 56473281 in words is "fifty-six million, four hundred seventy-three thousand, two hundred eighty-one".