28140164 has 24 divisors (see below), whose sum is σ = 53513880. Its totient is φ = 12870144.

The previous prime is 28140143. The next prime is 28140187. The reversal of 28140164 is 46104182.

It can be written as a sum of positive squares in 4 ways, for example, as 4032064 + 24108100 = 2008^2 + 4910^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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 7 ways as a sum of consecutive naturals, for example, 3482 + ... + 8270.

It is an arithmetic number, because the mean of its divisors is an integer number (2229745).

Almost surely, 2^28140164 is an apocalyptic number.

It is an amenable number.

28140164 is a deficient number, since it is larger than the sum of its proper divisors (25373716).

28140164 is a wasteful number, since it uses less digits than its factorization.

28140164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4919 (or 4917 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 28140164 is about 5304.7303418741. The cubic root of 28140164 is about 304.1647450766.

The spelling of 28140164 in words is "twenty-eight million, one hundred forty thousand, one hundred sixty-four".