28226788 has 6 divisors (see below), whose sum is σ = 49396886. Its totient is φ = 14113392.

The previous prime is 28226777. The next prime is 28226789. The reversal of 28226788 is 88762282.

It can be written as a sum of positive squares in only one way, i.e., 16990884 + 11235904 = 4122^2 + 3352^2 .

It is not an unprimeable number, because it can be changed into a prime (28226789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3528345 + ... + 3528352.

Almost surely, 2^28226788 is an apocalyptic number.

It is an amenable number.

28226788 is a deficient number, since it is larger than the sum of its proper divisors (21170098).

28226788 is a wasteful number, since it uses less digits than its factorization.

28226788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7056701 (or 7056699 counting only the distinct ones).

The product of its digits is 172032, while the sum is 43.

The square root of 28226788 is about 5312.8888563568. Note that the first 4 decimals coincide. The cubic root of 28226788 is about 304.4765292975.

The spelling of 28226788 in words is "twenty-eight million, two hundred twenty-six thousand, seven hundred eighty-eight".