7229128 has 8 divisors (see below), whose sum is σ = 13554630. Its totient is φ = 3614560.

The previous prime is 7229077. The next prime is 7229129. The reversal of 7229128 is 8219227.

It can be written as a sum of positive squares in only one way, i.e., 7086244 + 142884 = 2662^2 + 378^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×7229128³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7229128.

It is not an unprimeable number, because it can be changed into a prime (7229129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 451813 + ... + 451828.

Almost surely, 2^7229128 is an apocalyptic number.

It is an amenable number.

7229128 is a deficient number, since it is larger than the sum of its proper divisors (6325502).

7229128 is a wasteful number, since it uses less digits than its factorization.

7229128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903647 (or 903643 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 7229128 is about 2688.7037769156. The cubic root of 7229128 is about 193.3579226222.

Subtracting 7229128 from its reverse (8219227), we obtain a palindrome (990099).

The spelling of 7229128 in words is "seven million, two hundred twenty-nine thousand, one hundred twenty-eight".