28947028 has 24 divisors (see below), whose sum is σ = 55671840. Its totient is φ = 13060320.

The previous prime is 28946999. The next prime is 28947029. The reversal of 28947028 is 82074982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28947029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3750 + ... + 8482.

It is an arithmetic number, because the mean of its divisors is an integer number (2319660).

Almost surely, 2^28947028 is an apocalyptic number.

It is an amenable number.

28947028 is a deficient number, since it is larger than the sum of its proper divisors (26724812).

28947028 is a wasteful number, since it uses less digits than its factorization.

28947028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4887 (or 4885 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 28947028 is about 5380.2442323746. The cubic root of 28947028 is about 307.0445033045.

The spelling of 28947028 in words is "twenty-eight million, nine hundred forty-seven thousand, twenty-eight".