28609056 has 144 divisors (see below), whose sum is σ = 97179264. Its totient is φ = 7805952.

The previous prime is 28609027. The next prime is 28609057. The reversal of 28609056 is 65090682.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×28609056² = 1636956170422272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28609056.

It is not an unprimeable number, because it can be changed into a prime (28609057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46060 + ... + 46676.

It is an arithmetic number, because the mean of its divisors is an integer number (674856).

Almost surely, 2^28609056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28609056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48589632).

28609056 is an abundant number, since it is smaller than the sum of its proper divisors (68570208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28609056 is a wasteful number, since it uses less digits than its factorization.

28609056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 28609056 is about 5348.7434038286. The cubic root of 28609056 is about 305.8448527876.

It can be divided in two parts, 286090 and 56, that added together give a triangular number (286146 = T₇₅₆).

The spelling of 28609056 in words is "twenty-eight million, six hundred nine thousand, fifty-six".