56820281 has 16 divisors (see below), whose sum is σ = 68275200. Its totient is φ = 46232208.

The previous prime is 56820263. The next prime is 56820287. The reversal of 56820281 is 18202865.

It is not a de Polignac number, because 56820281 - 2⁶ = 56820217 is a prime.

It is a super-2 number, since 2×56820281² = 6457088665837922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56820287) 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 in 15 ways as a sum of consecutive naturals, for example, 21110 + ... + 23648.

It is an arithmetic number, because the mean of its divisors is an integer number (4267200).

Almost surely, 2^56820281 is an apocalyptic number.

It is an amenable number.

56820281 is a deficient number, since it is larger than the sum of its proper divisors (11454919).

56820281 is a wasteful number, since it uses less digits than its factorization.

56820281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2708.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 56820281 is about 7537.9228571272. The cubic root of 56820281 is about 384.4452143174.

It can be divided in two parts, 5 and 6820281, that added together give a palindrome (6820286).

The spelling of 56820281 in words is "fifty-six million, eight hundred twenty thousand, two hundred eighty-one".