28531456 has 36 divisors (see below), whose sum is σ = 57947400. Its totient is φ = 14016512.

The previous prime is 28531427. The next prime is 28531463. The reversal of 28531456 is 65413582.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14160 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (1609650).

Almost surely, 2^28531456 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 28531456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28973700).

28531456 is an abundant number, since it is smaller than the sum of its proper divisors (29415944).

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

28531456 is an equidigital number, since it uses as much as digits as its factorization.

28531456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964 (or 1950 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 28531456 is about 5341.4844378693. The cubic root of 28531456 is about 305.5680750254.

The spelling of 28531456 in words is "twenty-eight million, five hundred thirty-one thousand, four hundred fifty-six".