28445740 has 12 divisors (see below), whose sum is σ = 59736096. Its totient is φ = 11378288.

The previous prime is 28445701. The next prime is 28445749. The reversal of 28445740 is 4754482.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28445696 and 28445705.

It is not an unprimeable number, because it can be changed into a prime (28445749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711124 + ... + 711163.

It is an arithmetic number, because the mean of its divisors is an integer number (4978008).

Almost surely, 2^28445740 is an apocalyptic number.

28445740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28445740 is an abundant number, since it is smaller than the sum of its proper divisors (31290356).

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

28445740 is a wasteful number, since it uses less digits than its factorization.

28445740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422296 (or 1422294 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 28445740 is about 5333.4547902837. The cubic root of 28445740 is about 305.2617657800.

The spelling of 28445740 in words is "twenty-eight million, four hundred forty-five thousand, seven hundred forty".