2571220 has 24 divisors (see below), whose sum is σ = 5493600. Its totient is φ = 1010592.

The previous prime is 2571209. The next prime is 2571269. The reversal of 2571220 is 221752.

2571220 = 407² + 408² + ... + 421².

It is a super-2 number, since 2×2571220² = 13222344576800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91 + ... + 2269.

It is an arithmetic number, because the mean of its divisors is an integer number (228900).

2^2571220 is an apocalyptic number.

2571220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2571220 is an abundant number, since it is smaller than the sum of its proper divisors (2922380).

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

2571220 is a wasteful number, since it uses less digits than its factorization.

2571220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247 (or 2245 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 2571220 is about 1603.5024165869. The cubic root of 2571220 is about 136.9976379084.

Adding to 2571220 its reverse (221752), we get a palindrome (2792972).

The spelling of 2571220 in words is "two million, five hundred seventy-one thousand, two hundred twenty".