28528577 has 16 divisors (see below), whose sum is σ = 36329472. Its totient is φ = 21754320.

The previous prime is 28528571. The next prime is 28528603. The reversal of 28528577 is 77582582.

It is not a de Polignac number, because 28528577 - 2¹⁰ = 28527553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28528571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323 + ... + 7560.

It is an arithmetic number, because the mean of its divisors is an integer number (2270592).

Almost surely, 2^28528577 is an apocalyptic number.

It is an amenable number.

28528577 is a deficient number, since it is larger than the sum of its proper divisors (7800895).

28528577 is a wasteful number, since it uses less digits than its factorization.

28528577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948.

The product of its digits is 313600, while the sum is 44.

The square root of 28528577 is about 5341.2149366975. The cubic root of 28528577 is about 305.5577967782.

The spelling of 28528577 in words is "twenty-eight million, five hundred twenty-eight thousand, five hundred seventy-seven".