2881656 has 40 divisors (see below), whose sum is σ = 8073120. Its totient is φ = 960336.

The previous prime is 2881649. The next prime is 2881657. The reversal of 2881656 is 6561882.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2881656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2881657) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 1576 + ... + 2871.

It is an arithmetic number, because the mean of its divisors is an integer number (201828).

2^2881656 is an apocalyptic number.

It is an amenable number.

2881656 is an abundant number, since it is smaller than the sum of its proper divisors (5191464).

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

2881656 is a wasteful number, since it uses less digits than its factorization.

2881656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465 (or 4452 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 2881656 is about 1697.5441084107. The cubic root of 2881656 is about 142.3029964699.

The spelling of 2881656 in words is "two million, eight hundred eighty-one thousand, six hundred fifty-six".