28228776 has 32 divisors (see below), whose sum is σ = 70761600. Its totient is φ = 9384320.

The previous prime is 28228763. The next prime is 28228777. The reversal of 28228776 is 67782282.

It is not an unprimeable number, because it can be changed into a prime (28228777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8980 + ... + 11708.

It is an arithmetic number, because the mean of its divisors is an integer number (2211300).

Almost surely, 2^28228776 is an apocalyptic number.

It is an amenable number.

28228776 is an abundant number, since it is smaller than the sum of its proper divisors (42532824).

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

28228776 is a wasteful number, since it uses less digits than its factorization.

28228776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3169 (or 3165 counting only the distinct ones).

The product of its digits is 150528, while the sum is 42.

The square root of 28228776 is about 5313.0759452505. The cubic root of 28228776 is about 304.4836771781.

The spelling of 28228776 in words is "twenty-eight million, two hundred twenty-eight thousand, seven hundred seventy-six".