28475511 has 8 divisors (see below), whose sum is σ = 38037744. Its totient is φ = 18948480.

The previous prime is 28475479. The next prime is 28475537. The reversal of 28475511 is 11557482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28475511 - 2⁵ = 28475479 is a prime.

It is a super-2 number, since 2×28475511² = 1621709453422242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28475581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6850 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (4754718).

Almost surely, 2^28475511 is an apocalyptic number.

28475511 is a deficient number, since it is larger than the sum of its proper divisors (9562233).

28475511 is a wasteful number, since it uses less digits than its factorization.

28475511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17601.

The product of its digits is 11200, while the sum is 33.

The square root of 28475511 is about 5336.2450281073. The cubic root of 28475511 is about 305.3682231900.

The spelling of 28475511 in words is "twenty-eight million, four hundred seventy-five thousand, five hundred eleven".