28445040 has 160 divisors (see below), whose sum is σ = 105618240. Its totient is φ = 6994944.

The previous prime is 28445009. The next prime is 28445041. The reversal of 28445040 is 4054482.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28444995 and 28445013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28445041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27574 + ... + 28586.

It is an arithmetic number, because the mean of its divisors is an integer number (660114).

Almost surely, 2^28445040 is an apocalyptic number.

28445040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28445040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52809120).

28445040 is an abundant number, since it is smaller than the sum of its proper divisors (77173200).

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

28445040 is a wasteful number, since it uses less digits than its factorization.

28445040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 28445040 is about 5333.3891663744. The cubic root of 28445040 is about 305.2592617731.

The spelling of 28445040 in words is "twenty-eight million, four hundred forty-five thousand, forty".