28587533 has 24 divisors (see below), whose sum is σ = 33818400. Its totient is φ = 24058944.

The previous prime is 28587527. The next prime is 28587563. The reversal of 28587533 is 33578582.

It is not a de Polignac number, because 28587533 - 2¹⁴ = 28571149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28587563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92966 + ... + 93272.

It is an arithmetic number, because the mean of its divisors is an integer number (1409100).

Almost surely, 2^28587533 is an apocalyptic number.

It is an amenable number.

28587533 is a deficient number, since it is larger than the sum of its proper divisors (5230867).

28587533 is a wasteful number, since it uses less digits than its factorization.

28587533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 368 counting only the distinct ones).

The product of its digits is 201600, while the sum is 41.

The square root of 28587533 is about 5346.7310573845. The cubic root of 28587533 is about 305.7681364009.

The spelling of 28587533 in words is "twenty-eight million, five hundred eighty-seven thousand, five hundred thirty-three".