7220863 has 6 divisors (see below), whose sum is σ = 7819224. Its totient is φ = 6665256.

The previous prime is 7220849. The next prime is 7220867. The reversal of 7220863 is 3680227.

It is a de Polignac number, because none of the positive numbers 2^k-7220863 is a prime.

It is a Duffinian number.

7220863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21195 + ... + 21532.

It is an arithmetic number, because the mean of its divisors is an integer number (1303204).

Almost surely, 2^7220863 is an apocalyptic number.

7220863 is a deficient number, since it is larger than the sum of its proper divisors (598361).

7220863 is a wasteful number, since it uses less digits than its factorization.

7220863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42753 (or 42740 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 7220863 is about 2687.1663513821. The cubic root of 7220863 is about 193.2842063709.

The spelling of 7220863 in words is "seven million, two hundred twenty thousand, eight hundred sixty-three".