28394940 has 48 divisors (see below), whose sum is σ = 90865152. Its totient is φ = 6490176.

The previous prime is 28394929. The next prime is 28394941. The reversal of 28394940 is 4949382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28394941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33384 + ... + 34223.

It is an arithmetic number, because the mean of its divisors is an integer number (1893024).

Almost surely, 2^28394940 is an apocalyptic number.

28394940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28394940 is an abundant number, since it is smaller than the sum of its proper divisors (62470212).

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

28394940 is a wasteful number, since it uses less digits than its factorization.

28394940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67626 (or 67624 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 28394940 is about 5328.6902706012. The cubic root of 28394940 is about 305.0799396303.

The spelling of 28394940 in words is "twenty-eight million, three hundred ninety-four thousand, nine hundred forty".