28656147 has 24 divisors (see below), whose sum is σ = 42822000. Its totient is φ = 17017728.

The previous prime is 28656143. The next prime is 28656149. The reversal of 28656147 is 74165682.

It is not a de Polignac number, because 28656147 - 2² = 28656143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28656143) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 13729 + ... + 15677.

It is an arithmetic number, because the mean of its divisors is an integer number (1784250).

Almost surely, 2^28656147 is an apocalyptic number.

28656147 is a deficient number, since it is larger than the sum of its proper divisors (14165853).

28656147 is a wasteful number, since it uses less digits than its factorization.

28656147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007 (or 1994 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 28656147 is about 5353.1436558344. The cubic root of 28656147 is about 306.0125694354.

The spelling of 28656147 in words is "twenty-eight million, six hundred fifty-six thousand, one hundred forty-seven".