28387772 has 24 divisors (see below), whose sum is σ = 56899584. Its totient is φ = 12139632.

The previous prime is 28387771. The next prime is 28387787. The reversal of 28387772 is 27778382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387771) 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, 17333 + ... + 18899.

It is an arithmetic number, because the mean of its divisors is an integer number (2370816).

Almost surely, 2^28387772 is an apocalyptic number.

It is an amenable number.

28387772 is an abundant number, since it is smaller than the sum of its proper divisors (28511812).

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

28387772 is a wasteful number, since it uses less digits than its factorization.

28387772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2225 (or 2223 counting only the distinct ones).

The product of its digits is 263424, while the sum is 44.

The square root of 28387772 is about 5328.0176426134. The cubic root of 28387772 is about 305.0542660767.

The spelling of 28387772 in words is "twenty-eight million, three hundred eighty-seven thousand, seven hundred seventy-two".