55724217 has 4 divisors (see below), whose sum is σ = 74298960. Its totient is φ = 37149476.

The previous prime is 55724213. The next prime is 55724219. The reversal of 55724217 is 71242755.

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.

It is a cyclic number.

It is not a de Polignac number, because 55724217 - 2² = 55724213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55724213) 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, 9287367 + ... + 9287372.

It is an arithmetic number, because the mean of its divisors is an integer number (18574740).

Almost surely, 2^55724217 is an apocalyptic number.

It is an amenable number.

55724217 is a deficient number, since it is larger than the sum of its proper divisors (18574743).

55724217 is a wasteful number, since it uses less digits than its factorization.

55724217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18574742.

The product of its digits is 19600, while the sum is 33.

The square root of 55724217 is about 7464.8655044816. The cubic root of 55724217 is about 381.9571623975.

The spelling of 55724217 in words is "fifty-five million, seven hundred twenty-four thousand, two hundred seventeen".