2881978 has 12 divisors (see below), whose sum is σ = 4752090. Its totient is φ = 1309880.

The previous prime is 2881951. The next prime is 2882021. The reversal of 2881978 is 8791882.

It can be written as a sum of positive squares in only one way, i.e., 2614689 + 267289 = 1617^2 + 517^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5713 + ... + 6196.

2^2881978 is an apocalyptic number.

2881978 is a deficient number, since it is larger than the sum of its proper divisors (1870112).

2881978 is a wasteful number, since it uses less digits than its factorization.

2881978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11933 (or 11922 counting only the distinct ones).

The product of its digits is 64512, while the sum is 43.

The square root of 2881978 is about 1697.6389486578. The cubic root of 2881978 is about 142.3082966467.

The spelling of 2881978 in words is "two million, eight hundred eighty-one thousand, nine hundred seventy-eight".