55928217 has 4 divisors (see below), whose sum is σ = 74570960. Its totient is φ = 37285476.

The previous prime is 55928209. The next prime is 55928219. The reversal of 55928217 is 71282955.

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 not a de Polignac number, because 55928217 - 2³ = 55928209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55928219) 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, 9321367 + ... + 9321372.

It is an arithmetic number, because the mean of its divisors is an integer number (18642740).

Almost surely, 2^55928217 is an apocalyptic number.

It is an amenable number.

55928217 is a deficient number, since it is larger than the sum of its proper divisors (18642743).

55928217 is a wasteful number, since it uses less digits than its factorization.

55928217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18642742.

The product of its digits is 50400, while the sum is 39.

The square root of 55928217 is about 7478.5170321395. The cubic root of 55928217 is about 382.4226953006.

The spelling of 55928217 in words is "fifty-five million, nine hundred twenty-eight thousand, two hundred seventeen".