2571820 has 12 divisors (see below), whose sum is σ = 5400864. Its totient is φ = 1028720.

The previous prime is 2571809. The next prime is 2571823. The reversal of 2571820 is 281752.

It is a super-2 number, since 2×2571820² = 13228516224800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2571823) 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, 64276 + ... + 64315.

It is an arithmetic number, because the mean of its divisors is an integer number (450072).

2^2571820 is an apocalyptic number.

2571820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2571820 is an abundant number, since it is smaller than the sum of its proper divisors (2829044).

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

2571820 is a wasteful number, since it uses less digits than its factorization.

2571820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128600 (or 128598 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 2571820 is about 1603.6894961307. The cubic root of 2571820 is about 137.0082933158.

The spelling of 2571820 in words is "two million, five hundred seventy-one thousand, eight hundred twenty".