28581456 has 40 divisors (see below), whose sum is σ = 77048640. Its totient is φ = 9112576.

The previous prime is 28581409. The next prime is 28581457. The reversal of 28581456 is 65418582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28581457) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 11841 + ... + 14048.

It is an arithmetic number, because the mean of its divisors is an integer number (1926216).

Almost surely, 2^28581456 is an apocalyptic number.

It is an amenable number.

28581456 is an abundant number, since it is smaller than the sum of its proper divisors (48467184).

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

28581456 is a wasteful number, since it uses less digits than its factorization.

28581456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25923 (or 25917 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 28581456 is about 5346.1627360192. The cubic root of 28581456 is about 305.7464686266.

The spelling of 28581456 in words is "twenty-eight million, five hundred eighty-one thousand, four hundred fifty-six".