28891544 has 32 divisors (see below), whose sum is σ = 59302800. Its totient is φ = 13086720.

The previous prime is 28891537. The next prime is 28891559. The reversal of 28891544 is 44519882.

It is a congruent number.

It is an unprimeable number.

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, 49784 + ... + 50360.

Almost surely, 2^28891544 is an apocalyptic number.

It is an amenable number.

28891544 is an abundant number, since it is smaller than the sum of its proper divisors (30411256).

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

28891544 is a wasteful number, since it uses less digits than its factorization.

28891544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163 (or 1159 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 28891544 is about 5375.0854876923. The cubic root of 28891544 is about 306.8482027446.

The spelling of 28891544 in words is "twenty-eight million, eight hundred ninety-one thousand, five hundred forty-four".