2878866 has 12 divisors (see below), whose sum is σ = 6237582. Its totient is φ = 959616.

The previous prime is 2878853. The next prime is 2878867. The reversal of 2878866 is 6688782.

It can be written as a sum of positive squares in only one way, i.e., 2030625 + 848241 = 1425^2 + 921^2 .

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2878867) 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 5 ways as a sum of consecutive naturals, for example, 79951 + ... + 79986.

2^2878866 is an apocalyptic number.

2878866 is an abundant number, since it is smaller than the sum of its proper divisors (3358716).

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

2878866 is a wasteful number, since it uses less digits than its factorization.

2878866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159945 (or 159942 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 2878866 is about 1696.7221339984. The cubic root of 2878866 is about 142.2570560383.

The spelling of 2878866 in words is "two million, eight hundred seventy-eight thousand, eight hundred sixty-six".