28981536 has 48 divisors (see below), whose sum is σ = 80085600. Its totient is φ = 9151488.

The previous prime is 28981531. The next prime is 28981571. The reversal of 28981536 is 63518982.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28981531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6121 + ... + 9768.

It is an arithmetic number, because the mean of its divisors is an integer number (1668450).

Almost surely, 2^28981536 is an apocalyptic number.

It is an amenable number.

28981536 is an abundant number, since it is smaller than the sum of its proper divisors (51104064).

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

28981536 is a wasteful number, since it uses less digits than its factorization.

28981536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15921 (or 15913 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 28981536 is about 5383.4501948100. The cubic root of 28981536 is about 307.1664649808.

The spelling of 28981536 in words is "twenty-eight million, nine hundred eighty-one thousand, five hundred thirty-six".