28552689 has 16 divisors (see below), whose sum is σ = 46146240. Its totient is φ = 17304480.

The previous prime is 28552681. The next prime is 28552703. The reversal of 28552689 is 98625582.

It is not a de Polignac number, because 28552689 - 2³ = 28552681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28552681) 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, 47772 + ... + 48365.

It is an arithmetic number, because the mean of its divisors is an integer number (2884140).

Almost surely, 2^28552689 is an apocalyptic number.

It is an amenable number.

28552689 is a deficient number, since it is larger than the sum of its proper divisors (17593551).

28552689 is a wasteful number, since it uses less digits than its factorization.

28552689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96157 (or 96151 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 28552689 is about 5343.4716243281. The cubic root of 28552689 is about 305.6438570924.

It can be divided in two parts, 28552 and 689, that added together give a square (29241 = 171²).

The spelling of 28552689 in words is "twenty-eight million, five hundred fifty-two thousand, six hundred eighty-nine".