57220557 has 4 divisors (see below), whose sum is σ = 76294080. Its totient is φ = 38147036.

The previous prime is 57220529. The next prime is 57220561. The reversal of 57220557 is 75502275.

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 57220557 - 2¹⁵ = 57187789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57220507) 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, 9536757 + ... + 9536762.

It is an arithmetic number, because the mean of its divisors is an integer number (19073520).

Almost surely, 2^57220557 is an apocalyptic number.

It is an amenable number.

57220557 is a deficient number, since it is larger than the sum of its proper divisors (19073523).

57220557 is a wasteful number, since it uses less digits than its factorization.

57220557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19073522.

The product of its (nonzero) digits is 24500, while the sum is 33.

The square root of 57220557 is about 7564.4270767851. The cubic root of 57220557 is about 385.3458566396.

The spelling of 57220557 in words is "fifty-seven million, two hundred twenty thousand, five hundred fifty-seven".