57220000 has 60 divisors (see below), whose sum is σ = 140818986. Its totient is φ = 22880000.

The previous prime is 57219997. The next prime is 57220003. The reversal of 57220000 is 2275.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (57219997) and next prime (57220003).

It can be written as a sum of positive squares in 5 ways, for example, as 1089936 + 56130064 = 1044^2 + 7492^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (57220003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18570 + ... + 21430.

Almost surely, 2^57220000 is an apocalyptic number.

57220000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70409493).

57220000 is an abundant number, since it is smaller than the sum of its proper divisors (83598986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57220000 is an equidigital number, since it uses as much as digits as its factorization.

57220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2891 (or 2868 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 57220000 is about 7564.3902596310. The cubic root of 57220000 is about 385.3446062828.

Adding to 57220000 its reverse (2275), we get a palindrome (57222275).

The spelling of 57220000 in words is "fifty-seven million, two hundred twenty thousand".