2220778 has 48 divisors (see below), whose sum is σ = 4333824. Its totient is φ = 846720.

The previous prime is 2220773. The next prime is 2220787. The reversal of 2220778 is 8770222.

2220778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

2220778 is a nontrivial binomial coefficient, being equal to C(2108, 2).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2220773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51625 + ... + 51667.

It is an arithmetic number, because the mean of its divisors is an integer number (90288).

2^2220778 is an apocalyptic number.

2220778 is the 2107-th triangular number and also the 1054-th hexagonal number.

2220778 is the 703-rd centered nonagonal number.

2220778 is a deficient number, since it is larger than the sum of its proper divisors (2113046).

2220778 is a wasteful number, since it uses less digits than its factorization.

2220778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 2220778 is about 1490.2274994107. The cubic root of 2220778 is about 130.4673122184.

It can be divided in two parts, 2 and 220778, that added together give a triangular number (220780 = T₆₆₄).

The spelling of 2220778 in words is "two million, two hundred twenty thousand, seven hundred seventy-eight".