28515855 has 16 divisors (see below), whose sum is σ = 46487520. Its totient is φ = 14921088.

The previous prime is 28515841. The next prime is 28515871. The reversal of 28515855 is 55851582.

It is not a de Polignac number, because 28515855 - 2¹³ = 28507663 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, 17140 + ... + 18729.

It is an arithmetic number, because the mean of its divisors is an integer number (2905470).

Almost surely, 2^28515855 is an apocalyptic number.

28515855 is a deficient number, since it is larger than the sum of its proper divisors (17971665).

28515855 is a wasteful number, since it uses less digits than its factorization.

28515855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35930.

The product of its digits is 80000, while the sum is 39.

The square root of 28515855 is about 5340.0238763511. The cubic root of 28515855 is about 305.5123699971.

The spelling of 28515855 in words is "twenty-eight million, five hundred fifteen thousand, eight hundred fifty-five".