56220257 has 4 divisors (see below), whose sum is σ = 58664640. Its totient is φ = 53775876.

The previous prime is 56220251. The next prime is 56220289. The reversal of 56220257 is 75202265.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75202265 = 5 ⋅15040453.

It is a cyclic number.

It is not a de Polignac number, because 56220257 - 2¹⁸ = 55958113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56220251) 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, 1222157 + ... + 1222202.

It is an arithmetic number, because the mean of its divisors is an integer number (14666160).

Almost surely, 2^56220257 is an apocalyptic number.

It is an amenable number.

56220257 is a deficient number, since it is larger than the sum of its proper divisors (2444383).

56220257 is a wasteful number, since it uses less digits than its factorization.

56220257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444382.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 56220257 is about 7498.0168711467. The cubic root of 56220257 is about 383.0871714267.

The spelling of 56220257 in words is "fifty-six million, two hundred twenty thousand, two hundred fifty-seven".