28928985 has 32 divisors (see below), whose sum is σ = 50222592. Its totient is φ = 14161920.

The previous prime is 28928957. The next prime is 28929023. The reversal of 28928985 is 58982982.

28928985 is nontrivially palindromic in base 12.

It is not a de Polignac number, because 28928985 - 2⁵ = 28928953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9072 + ... + 11838.

It is an arithmetic number, because the mean of its divisors is an integer number (1569456).

Almost surely, 2^28928985 is an apocalyptic number.

It is an amenable number.

28928985 is a deficient number, since it is larger than the sum of its proper divisors (21293607).

28928985 is a wasteful number, since it uses less digits than its factorization.

28928985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833.

The product of its digits is 829440, while the sum is 51.

The square root of 28928985 is about 5378.5671883876. The cubic root of 28928985 is about 306.9806953099.

The spelling of 28928985 in words is "twenty-eight million, nine hundred twenty-eight thousand, nine hundred eighty-five".