28458440 has 32 divisors (see below), whose sum is σ = 64532160. Its totient is φ = 11294400.

The previous prime is 28458431. The next prime is 28458457. The reversal of 28458440 is 4485482.

It is a self number, because there is not a number n which added to its sum of digits gives 28458440.

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 7 ways as a sum of consecutive naturals, for example, 2525 + ... + 7955.

It is an arithmetic number, because the mean of its divisors is an integer number (2016630).

Almost surely, 2^28458440 is an apocalyptic number.

28458440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28458440 is an abundant number, since it is smaller than the sum of its proper divisors (36073720).

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

28458440 is a wasteful number, since it uses less digits than its factorization.

28458440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5573 (or 5569 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 35.

The square root of 28458440 is about 5334.6452553099. The cubic root of 28458440 is about 305.3071884879.

The spelling of 28458440 in words is "twenty-eight million, four hundred fifty-eight thousand, four hundred forty".