55724881 has 4 divisors (see below), whose sum is σ = 55743652. Its totient is φ = 55706112.

The previous prime is 55724873. The next prime is 55724897. The reversal of 55724881 is 18842755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18842755 = 5 ⋅3768551.

It can be written as a sum of positive squares in 2 ways, for example, as 14508481 + 41216400 = 3809^2 + 6420^2 .

It is a cyclic number.

It is not a de Polignac number, because 55724881 - 2³ = 55724873 is a prime.

It is a super-2 number, since 2×55724881² = 6210524724928322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55721881) 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, 3840 + ... + 11233.

It is an arithmetic number, because the mean of its divisors is an integer number (13935913).

Almost surely, 2^55724881 is an apocalyptic number.

It is an amenable number.

55724881 is a deficient number, since it is larger than the sum of its proper divisors (18771).

55724881 is a wasteful number, since it uses less digits than its factorization.

55724881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18770.

The product of its digits is 89600, while the sum is 40.

The square root of 55724881 is about 7464.9099793634. The cubic root of 55724881 is about 381.9586795030.

The spelling of 55724881 in words is "fifty-five million, seven hundred twenty-four thousand, eight hundred eighty-one".