28441440 has 72 divisors (see below), whose sum is σ = 97061328. Its totient is φ = 7584000.

The previous prime is 28441421. The next prime is 28441453. The reversal of 28441440 is 4414482.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

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, 8436 + ... + 11315.

It is an arithmetic number, because the mean of its divisors is an integer number (1348074).

Almost surely, 2^28441440 is an apocalyptic number.

28441440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28441440 is an abundant number, since it is smaller than the sum of its proper divisors (68619888).

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

28441440 is a wasteful number, since it uses less digits than its factorization.

28441440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19772 (or 19761 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 28441440 is about 5333.0516592285. The cubic root of 28441440 is about 305.2463833743.

The spelling of 28441440 in words is "twenty-eight million, four hundred forty-one thousand, four hundred forty".