28553772 has 24 divisors (see below), whose sum is σ = 71750896. Its totient is φ = 8785728.

The previous prime is 28553737. The next prime is 28553773. The reversal of 28553772 is 27735582.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 28553772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28553773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91363 + ... + 91674.

Almost surely, 2^28553772 is an apocalyptic number.

It is an amenable number.

28553772 is an abundant number, since it is smaller than the sum of its proper divisors (43197124).

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

28553772 is a wasteful number, since it uses less digits than its factorization.

28553772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183057 (or 183055 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 28553772 is about 5343.5729619797. The cubic root of 28553772 is about 305.6477213882.

The spelling of 28553772 in words is "twenty-eight million, five hundred fifty-three thousand, seven hundred seventy-two".