28881545 has 16 divisors (see below), whose sum is σ = 43210368. Its totient is φ = 18003840.

The previous prime is 28881527. The next prime is 28881551. The reversal of 28881545 is 54518882.

It is a happy number.

It is not a de Polignac number, because 28881545 - 2⁸ = 28881289 is a prime.

It is a Duffinian number.

It is a Curzon 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, 37124 + ... + 37893.

It is an arithmetic number, because the mean of its divisors is an integer number (2700648).

Almost surely, 2^28881545 is an apocalyptic number.

It is an amenable number.

28881545 is a deficient number, since it is larger than the sum of its proper divisors (14328823).

28881545 is a wasteful number, since it uses less digits than its factorization.

28881545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75040.

The product of its digits is 102400, while the sum is 41.

The square root of 28881545 is about 5374.1552824607. The cubic root of 28881545 is about 306.8127998923.

The spelling of 28881545 in words is "twenty-eight million, eight hundred eighty-one thousand, five hundred forty-five".