28228536 has 48 divisors (see below), whose sum is σ = 87375600. Its totient is φ = 8065152.

The previous prime is 28228523. The next prime is 28228553. The reversal of 28228536 is 63582282.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28228536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27501 + ... + 28508.

It is an arithmetic number, because the mean of its divisors is an integer number (1820325).

Almost surely, 2^28228536 is an apocalyptic number.

It is an amenable number.

28228536 is an abundant number, since it is smaller than the sum of its proper divisors (59147064).

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

28228536 is a wasteful number, since it uses less digits than its factorization.

28228536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56028 (or 56021 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 28228536 is about 5313.0533594158. The cubic root of 28228536 is about 304.4828142727.

The spelling of 28228536 in words is "twenty-eight million, two hundred twenty-eight thousand, five hundred thirty-six".