28603440 has 60 divisors (see below), whose sum is σ = 96062304. Its totient is φ = 7627392.

The previous prime is 28603429. The next prime is 28603441. The reversal of 28603440 is 4430682.

It is a tau number, because it is divible by the number of its divisors (60).

It is not an unprimeable number, because it can be changed into a prime (28603441) 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 11 ways as a sum of consecutive naturals, for example, 19144 + ... + 20583.

Almost surely, 2^28603440 is an apocalyptic number.

28603440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28603440 is an abundant number, since it is smaller than the sum of its proper divisors (67458864).

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

28603440 is a wasteful number, since it uses less digits than its factorization.

28603440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39746 (or 39737 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28603440 is about 5348.2183949424. The cubic root of 28603440 is about 305.8248388790.

The spelling of 28603440 in words is "twenty-eight million, six hundred three thousand, four hundred forty".