57220355 has 4 divisors (see below), whose sum is σ = 68664432. Its totient is φ = 45776280.

The previous prime is 57220333. The next prime is 57220357. The reversal of 57220355 is 55302275.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 57220355 - 2⁸ = 57220099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57220357) 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, 5722031 + ... + 5722040.

It is an arithmetic number, because the mean of its divisors is an integer number (17166108).

Almost surely, 2^57220355 is an apocalyptic number.

57220355 is a deficient number, since it is larger than the sum of its proper divisors (11444077).

57220355 is a wasteful number, since it uses less digits than its factorization.

57220355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11444076.

The product of its (nonzero) digits is 10500, while the sum is 29.

The square root of 57220355 is about 7564.4137248038. The cubic root of 57220355 is about 385.3454031898.

It can be divided in two parts, 57220 and 355, that added together give a palindrome (57575).

The spelling of 57220355 in words is "fifty-seven million, two hundred twenty thousand, three hundred fifty-five".