28528647 has 8 divisors (see below), whose sum is σ = 43472256. Its totient is φ = 16302072.

The previous prime is 28528639. The next prime is 28528657. The reversal of 28528647 is 74682582.

It is a happy number.

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

It is not a de Polignac number, because 28528647 - 2³ = 28528639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28528599 and 28528608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679233 + ... + 679274.

It is an arithmetic number, because the mean of its divisors is an integer number (5434032).

Almost surely, 2^28528647 is an apocalyptic number.

28528647 is a deficient number, since it is larger than the sum of its proper divisors (14943609).

28528647 is a wasteful number, since it uses less digits than its factorization.

28528647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358517.

The product of its digits is 215040, while the sum is 42.

The square root of 28528647 is about 5341.2214895097. The cubic root of 28528647 is about 305.5580466917.

The spelling of 28528647 in words is "twenty-eight million, five hundred twenty-eight thousand, six hundred forty-seven".