28540815 has 16 divisors (see below), whose sum is σ = 47651328. Its totient is φ = 14559776.

The previous prime is 28540789. The next prime is 28540823. The reversal of 28540815 is 51804582.

It is a cyclic number.

It is not a de Polignac number, because 28540815 - 2⁶ = 28540751 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, 41019 + ... + 41708.

It is an arithmetic number, because the mean of its divisors is an integer number (2978208).

Almost surely, 2^28540815 is an apocalyptic number.

28540815 is a deficient number, since it is larger than the sum of its proper divisors (19110513).

28540815 is a wasteful number, since it uses less digits than its factorization.

28540815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82758.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 28540815 is about 5342.3604333665. The cubic root of 28540815 is about 305.6014825853.

The spelling of 28540815 in words is "twenty-eight million, five hundred forty thousand, eight hundred fifteen".