28528971 has 8 divisors (see below), whose sum is σ = 38092800. Its totient is φ = 18992232.

The previous prime is 28528967. The next prime is 28528979. The reversal of 28528971 is 17982582.

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

It is not a de Polignac number, because 28528971 - 2² = 28528967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28528979) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 4171 + ... + 8628.

It is an arithmetic number, because the mean of its divisors is an integer number (4761600).

Almost surely, 2^28528971 is an apocalyptic number.

28528971 is a deficient number, since it is larger than the sum of its proper divisors (9563829).

28528971 is a wasteful number, since it uses less digits than its factorization.

28528971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13545.

The product of its digits is 80640, while the sum is 42.

The square root of 28528971 is about 5341.2518195644. The cubic root of 28528971 is about 305.5592034287.

The spelling of 28528971 in words is "twenty-eight million, five hundred twenty-eight thousand, nine hundred seventy-one".