28528617 has 8 divisors (see below), whose sum is σ = 40964224. Its totient is φ = 17556048.

The previous prime is 28528609. The next prime is 28528639. The reversal of 28528617 is 71682582.

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

It is not a de Polignac number, because 28528617 - 2³ = 28528609 is a prime.

It is a super-3 number, since 3×28528617³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 731503 = 28528617 / (2 + 8 + 5 + 2 + 8 + 6 + 1 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28528607) 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, 365713 + ... + 365790.

It is an arithmetic number, because the mean of its divisors is an integer number (5120528).

Almost surely, 2^28528617 is an apocalyptic number.

It is an amenable number.

28528617 is a deficient number, since it is larger than the sum of its proper divisors (12435607).

28528617 is a wasteful number, since it uses less digits than its factorization.

28528617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731519.

The product of its digits is 53760, while the sum is 39.

The square root of 28528617 is about 5341.2186811626. The cubic root of 28528617 is about 305.5579395859.

The spelling of 28528617 in words is "twenty-eight million, five hundred twenty-eight thousand, six hundred seventeen".