28387072 has 108 divisors (see below), whose sum is σ = 68972736. Its totient is φ = 11612160.

The previous prime is 28387067. The next prime is 28387081. The reversal of 28387072 is 27078382.

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, 388828 + ... + 388900.

Almost surely, 2^28387072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28387072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34486368).

28387072 is an abundant number, since it is smaller than the sum of its proper divisors (40585664).

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

28387072 is an equidigital number, since it uses as much as digits as its factorization.

28387072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 28387072 is about 5327.9519517353. The cubic root of 28387072 is about 305.0517586621.

The spelling of 28387072 in words is "twenty-eight million, three hundred eighty-seven thousand, seventy-two".