28552909 has 16 divisors (see below), whose sum is σ = 35715456. Its totient is φ = 22176000.

The previous prime is 28552897. The next prime is 28552919. The reversal of 28552909 is 90925582.

It is not a de Polignac number, because 28552909 - 2¹⁷ = 28421837 is a prime.

It is a super-2 number, since 2×28552909² = 1630537224724562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28552919) 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, 45969 + ... + 46585.

It is an arithmetic number, because the mean of its divisors is an integer number (2232216).

Almost surely, 2^28552909 is an apocalyptic number.

It is an amenable number.

28552909 is a deficient number, since it is larger than the sum of its proper divisors (7162547).

28552909 is a wasteful number, since it uses less digits than its factorization.

28552909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 28552909 is about 5343.4922101562. The cubic root of 28552909 is about 305.6446420911.

The spelling of 28552909 in words is "twenty-eight million, five hundred fifty-two thousand, nine hundred nine".