28091536 has 40 divisors (see below), whose sum is σ = 59755104. Its totient is φ = 12687360.

The previous prime is 28091527. The next prime is 28091551. The reversal of 28091536 is 63519082.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct 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, 33555 + ... + 34381.

Almost surely, 2^28091536 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 28091536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29877552).

28091536 is an abundant number, since it is smaller than the sum of its proper divisors (31663568).

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

28091536 is a wasteful number, since it uses less digits than its factorization.

28091536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1033 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28091536 is about 5300.1449036795. The cubic root of 28091536 is about 303.9894386913.

The spelling of 28091536 in words is "twenty-eight million, ninety-one thousand, five hundred thirty-six".