28389456 has 60 divisors (see below), whose sum is σ = 84131892. Its totient is φ = 8905728.

The previous prime is 28389409. The next prime is 28389467. The reversal of 28389456 is 65498382.

It can be written as a sum of positive squares in 2 ways, for example, as 23619600 + 4769856 = 4860^2 + 2184^2 .

It is a super-2 number, since 2×28389456² = 1611922423951872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3351 + ... + 8246.

Almost surely, 2^28389456 is an apocalyptic number.

It is an amenable number.

28389456 is an abundant number, since it is smaller than the sum of its proper divisors (55742436).

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

28389456 is a wasteful number, since it uses less digits than its factorization.

28389456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11628 (or 11619 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 28389456 is about 5328.1756727796. The cubic root of 28389456 is about 305.0602980309.

The spelling of 28389456 in words is "twenty-eight million, three hundred eighty-nine thousand, four hundred fifty-six".