28081537 has 8 divisors (see below), whose sum is σ = 31347360. Its totient is φ = 24934560.

The previous prime is 28081523. The next prime is 28081589. The reversal of 28081537 is 73518082.

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 28081537 - 2¹¹ = 28079489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28081507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29212 + ... + 30157.

It is an arithmetic number, because the mean of its divisors is an integer number (3918420).

Almost surely, 2^28081537 is an apocalyptic number.

It is an amenable number.

28081537 is a deficient number, since it is larger than the sum of its proper divisors (3265823).

28081537 is a wasteful number, since it uses less digits than its factorization.

28081537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59423.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 28081537 is about 5299.2015436290. The cubic root of 28081537 is about 303.9533667215.

The spelling of 28081537 in words is "twenty-eight million, eighty-one thousand, five hundred thirty-seven".