28091135 has 8 divisors (see below), whose sum is σ = 33799680.
Its totient is φ = 22412704.
The previous prime is 28091131. The next prime is 28091137. The reversal of 28091135 is 53119082.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 28091135 - 22 = 28091131 is a prime.
It is a super-2 number, since 2×280911352 = 1578223731176450, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 28091098 and 28091107.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (28091131) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5420 + ... + 9249.
It is an arithmetic number, because the mean of its divisors is an integer number (4224960).
It is the magic constant of a 383 × 383 magic square.
Almost surely, 228091135 is an apocalyptic number.
28091135 is a deficient number, since it is larger than the sum of its proper divisors (5708545).
28091135 is a wasteful number, since it uses less digits than its factorization.
28091135 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 15057.
The product of its (nonzero) digits is 2160, while the sum is 29.
The square root of 28091135 is about 5300.1070743901.
The cubic root of 28091135 is about 303.9879922254.
The spelling of 28091135 in words is "twenty-eight million, ninety-one thousand, one hundred thirty-five".