7222428 has 36 divisors (see below), whose sum is σ = 18338320. Its totient is φ = 2396736.

The previous prime is 7222427. The next prime is 7222429. The reversal of 7222428 is 8242227.

7222428 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7222427) and next prime (7222429).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7222427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15576 + ... + 16032.

Almost surely, 2^7222428 is an apocalyptic number.

It is an amenable number.

7222428 is an abundant number, since it is smaller than the sum of its proper divisors (11115892).

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

7222428 is a wasteful number, since it uses less digits than its factorization.

7222428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 901 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 7222428 is about 2687.4575345482. The cubic root of 7222428 is about 193.2981690571.

It can be divided in two parts, 72 and 22428, that added together give a square (22500 = 150²).

The spelling of 7222428 in words is "seven million, two hundred twenty-two thousand, four hundred twenty-eight".