28820552 has 32 divisors (see below), whose sum is σ = 55685880. Its totient is φ = 13977600.

The previous prime is 28820531. The next prime is 28820569. The reversal of 28820552 is 25502882.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28665316 + 155236 = 5354^2 + 394^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42488 + ... + 43160.

Almost surely, 2^28820552 is an apocalyptic number.

It is an amenable number.

28820552 is a deficient number, since it is larger than the sum of its proper divisors (26865328).

28820552 is a wasteful number, since it uses less digits than its factorization.

28820552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 829 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 28820552 is about 5368.4776240569. The cubic root of 28820552 is about 306.5966685439.

The spelling of 28820552 in words is "twenty-eight million, eight hundred twenty thousand, five hundred fifty-two".