28881535 has 16 divisors (see below), whose sum is σ = 36014400. Its totient is φ = 22208256.

The previous prime is 28881527. The next prime is 28881551. The reversal of 28881535 is 53518882.

It is a cyclic number.

It is not a de Polignac number, because 28881535 - 2³ = 28881527 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59062 + ... + 59548.

It is an arithmetic number, because the mean of its divisors is an integer number (2250900).

Almost surely, 2^28881535 is an apocalyptic number.

28881535 is a deficient number, since it is larger than the sum of its proper divisors (7132865).

28881535 is a wasteful number, since it uses less digits than its factorization.

28881535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930.

The product of its digits is 76800, while the sum is 40.

The square root of 28881535 is about 5374.1543520818. The cubic root of 28881535 is about 306.8127644818.

The spelling of 28881535 in words is "twenty-eight million, eight hundred eighty-one thousand, five hundred thirty-five".