28906515 has 48 divisors (see below), whose sum is σ = 57058560. Its totient is φ = 13400640.

The previous prime is 28906483. The next prime is 28906523. The reversal of 28906515 is 51560982.

It is a happy number.

It is not a de Polignac number, because 28906515 - 2⁵ = 28906483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28906515.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 10116 + ... + 12654.

It is an arithmetic number, because the mean of its divisors is an integer number (1188720).

Almost surely, 2^28906515 is an apocalyptic number.

28906515 is a deficient number, since it is larger than the sum of its proper divisors (28152045).

28906515 is a wasteful number, since it uses less digits than its factorization.

28906515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584 (or 2581 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 28906515 is about 5376.4779363446. The cubic root of 28906515 is about 306.9011943881.

The spelling of 28906515 in words is "twenty-eight million, nine hundred six thousand, five hundred fifteen".