28722356 has 12 divisors (see below), whose sum is σ = 54130692. Its totient is φ = 13256448.

The previous prime is 28722349. The next prime is 28722359. The reversal of 28722356 is 65322782.

It can be written as a sum of positive squares in 2 ways, for example, as 3118756 + 25603600 = 1766^2 + 5060^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28722359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276125 + ... + 276228.

It is an arithmetic number, because the mean of its divisors is an integer number (4510891).

Almost surely, 2^28722356 is an apocalyptic number.

28722356 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28722356 is a deficient number, since it is larger than the sum of its proper divisors (25408336).

28722356 is a wasteful number, since it uses less digits than its factorization.

28722356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552370 (or 552368 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 28722356 is about 5359.3242111296. The cubic root of 28722356 is about 306.2480651828.

The spelling of 28722356 in words is "twenty-eight million, seven hundred twenty-two thousand, three hundred fifty-six".