28475647 has 4 divisors (see below), whose sum is σ = 28491480. Its totient is φ = 28459816.

The previous prime is 28475591. The next prime is 28475669. The reversal of 28475647 is 74657482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74657482 = 2 ⋅37328741.

It is a cyclic number.

It is not a de Polignac number, because 28475647 - 2¹⁵ = 28442879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28475687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4813 + ... + 8950.

It is an arithmetic number, because the mean of its divisors is an integer number (7122870).

Almost surely, 2^28475647 is an apocalyptic number.

28475647 is a deficient number, since it is larger than the sum of its proper divisors (15833).

28475647 is a wasteful number, since it uses less digits than its factorization.

28475647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15832.

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

The square root of 28475647 is about 5336.2577711351. The cubic root of 28475647 is about 305.3687093389.

The spelling of 28475647 in words is "twenty-eight million, four hundred seventy-five thousand, six hundred forty-seven".