28528172 has 6 divisors (see below), whose sum is σ = 49924308. Its totient is φ = 14264084.

The previous prime is 28528163. The next prime is 28528183. The reversal of 28528172 is 27182582.

It is a super-3 number, since 3×28528172³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3566018 + ... + 3566025.

It is an arithmetic number, because the mean of its divisors is an integer number (8320718).

Almost surely, 2^28528172 is an apocalyptic number.

It is an amenable number.

28528172 is a deficient number, since it is larger than the sum of its proper divisors (21396136).

28528172 is a wasteful number, since it uses less digits than its factorization.

28528172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7132047 (or 7132045 counting only the distinct ones).

The product of its digits is 17920, while the sum is 35.

The square root of 28528172 is about 5341.1770238403. The cubic root of 28528172 is about 305.5563508421.

The spelling of 28528172 in words is "twenty-eight million, five hundred twenty-eight thousand, one hundred seventy-two".