28653444 has 72 divisors (see below), whose sum is σ = 77007840. Its totient is φ = 8957952.

The previous prime is 28653439. The next prime is 28653473. The reversal of 28653444 is 44435682.

28653444 is a `hidden beast` number, since 2 + 86 + 534 + 44 = 666.

It is a super-2 number, since 2×28653444² = 1642039706122272, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 28653399 and 28653408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111364 + ... + 111620.

Almost surely, 2^28653444 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 28653444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38503920).

28653444 is an abundant number, since it is smaller than the sum of its proper divisors (48354396).

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

28653444 is a wasteful number, since it uses less digits than its factorization.

28653444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 444 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 28653444 is about 5352.8911814084. The cubic root of 28653444 is about 306.0029475559.

The spelling of 28653444 in words is "twenty-eight million, six hundred fifty-three thousand, four hundred forty-four".