55757217 has 4 divisors (see below), whose sum is σ = 74342960. Its totient is φ = 37171476.

The previous prime is 55757201. The next prime is 55757239. The reversal of 55757217 is 71275755.

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 55757217 - 2⁴ = 55757201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55757257) 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, 9292867 + ... + 9292872.

It is an arithmetic number, because the mean of its divisors is an integer number (18585740).

Almost surely, 2^55757217 is an apocalyptic number.

It is an amenable number.

55757217 is a deficient number, since it is larger than the sum of its proper divisors (18585743).

55757217 is a wasteful number, since it uses less digits than its factorization.

55757217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18585742.

The product of its digits is 85750, while the sum is 39.

The square root of 55757217 is about 7467.0755319603. The cubic root of 55757217 is about 382.0325461338.

The spelling of 55757217 in words is "fifty-five million, seven hundred fifty-seven thousand, two hundred seventeen".