2856520 has 16 divisors (see below), whose sum is σ = 6427260. Its totient is φ = 1142592.

The previous prime is 2856509. The next prime is 2856521. The reversal of 2856520 is 256582.

It can be written as a sum of positive squares in 2 ways, for example, as 2842596 + 13924 = 1686^2 + 118^2 .

It is not an unprimeable number, because it can be changed into a prime (2856521) 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, 35667 + ... + 35746.

2^2856520 is an apocalyptic number.

2856520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2856520 is an abundant number, since it is smaller than the sum of its proper divisors (3570740).

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

2856520 is a wasteful number, since it uses less digits than its factorization.

2856520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71424 (or 71420 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 2856520 is about 1690.1242557871. The cubic root of 2856520 is about 141.8880291682. Note that the first 3 decimals are identical.

The spelling of 2856520 in words is "two million, eight hundred fifty-six thousand, five hundred twenty".