7228638 has 24 divisors (see below), whose sum is σ = 16584048. Its totient is φ = 2267712.

The previous prime is 7228631. The next prime is 7228651. The reversal of 7228638 is 8368227.

It is a happy number.

It is a super-3 number, since 3×7228638³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7228631) 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, 11506 + ... + 12117.

It is an arithmetic number, because the mean of its divisors is an integer number (691002).

Almost surely, 2^7228638 is an apocalyptic number.

7228638 is an abundant number, since it is smaller than the sum of its proper divisors (9355410).

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

7228638 is a wasteful number, since it uses less digits than its factorization.

7228638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23648 (or 23645 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 7228638 is about 2688.6126533958. The cubic root of 7228638 is about 193.3535538370.

The spelling of 7228638 in words is "seven million, two hundred twenty-eight thousand, six hundred thirty-eight".