28371940 has 48 divisors (see below), whose sum is σ = 63201600. Its totient is φ = 10668672.

The previous prime is 28371923. The next prime is 28371971. The reversal of 28371940 is 4917382.

It is a junction number, because it is equal to n+sod(n) for n = 28371896 and 28371905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74671 + ... + 75049.

It is an arithmetic number, because the mean of its divisors is an integer number (1316700).

Almost surely, 2^28371940 is an apocalyptic number.

28371940 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 28371940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31600800).

28371940 is an abundant number, since it is smaller than the sum of its proper divisors (34829660).

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

28371940 is a wasteful number, since it uses less digits than its factorization.

28371940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 28371940 is about 5326.5317045898. The cubic root of 28371940 is about 304.9975454429.

The spelling of 28371940 in words is "twenty-eight million, three hundred seventy-one thousand, nine hundred forty".