28449140 has 24 divisors (see below), whose sum is σ = 59845632. Its totient is φ = 11360160.

The previous prime is 28449133. The next prime is 28449149. The reversal of 28449140 is 4194482.

It is a junction number, because it is equal to n+sod(n) for n = 28449097 and 28449106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18605 + ... + 20075.

It is an arithmetic number, because the mean of its divisors is an integer number (2493568).

Almost surely, 2^28449140 is an apocalyptic number.

28449140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28449140 is an abundant number, since it is smaller than the sum of its proper divisors (31396492).

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

28449140 is a wasteful number, since it uses less digits than its factorization.

28449140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447 (or 2445 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28449140 is about 5333.7735235010. The cubic root of 28449140 is about 305.2739275150.

The spelling of 28449140 in words is "twenty-eight million, four hundred forty-nine thousand, one hundred forty".