28016940 has 96 divisors (see below), whose sum is σ = 91897344. Its totient is φ = 6243840.

The previous prime is 28016897. The next prime is 28016957. The reversal of 28016940 is 4961082.

28016940 = 113² + 114² + ... + 440².

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28016898 and 28016907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16407 + ... + 18033.

It is an arithmetic number, because the mean of its divisors is an integer number (957264).

Almost surely, 2^28016940 is an apocalyptic number.

28016940 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 28016940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45948672).

28016940 is an abundant number, since it is smaller than the sum of its proper divisors (63880404).

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

28016940 is a wasteful number, since it uses less digits than its factorization.

28016940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687 (or 1685 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28016940 is about 5293.1030596428. The cubic root of 28016940 is about 303.7201227197.

The spelling of 28016940 in words is "twenty-eight million, sixteen thousand, nine hundred forty".