28647745 has 16 divisors (see below), whose sum is σ = 39957120. Its totient is φ = 19309824.

The previous prime is 28647743. The next prime is 28647757. The reversal of 28647745 is 54774682.

It is a cyclic number.

It is not a de Polignac number, because 28647745 - 2¹ = 28647743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28647743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4872 + ... + 9001.

It is an arithmetic number, because the mean of its divisors is an integer number (2497320).

Almost surely, 2^28647745 is an apocalyptic number.

It is an amenable number.

28647745 is a deficient number, since it is larger than the sum of its proper divisors (11309375).

28647745 is a wasteful number, since it uses less digits than its factorization.

28647745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13944.

The product of its digits is 376320, while the sum is 43.

The square root of 28647745 is about 5352.3588257889. The cubic root of 28647745 is about 305.9826588205.

It can be divided in two parts, 28647 and 745, that added together give a palindrome (29392).

The spelling of 28647745 in words is "twenty-eight million, six hundred forty-seven thousand, seven hundred forty-five".