28106940 has 48 divisors (see below), whose sum is σ = 80381952. Its totient is φ = 7334976.

The previous prime is 28106927. The next prime is 28106941. The reversal of 28106940 is 4960182.

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 = 28106898 and 28106907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28106941) 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, 2164 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (1674624).

Almost surely, 2^28106940 is an apocalyptic number.

28106940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28106940 is an abundant number, since it is smaller than the sum of its proper divisors (52275012).

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

28106940 is a wasteful number, since it uses less digits than its factorization.

28106940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10026 (or 10024 counting only the distinct ones).

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

The square root of 28106940 is about 5301.5978723400. The cubic root of 28106940 is about 304.0449927635.

The spelling of 28106940 in words is "twenty-eight million, one hundred six thousand, nine hundred forty".