28140012 has 36 divisors (see below), whose sum is σ = 71831760. Its totient is φ = 9287712.

The previous prime is 28140011. The next prime is 28140023. The reversal of 28140012 is 21004182.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (28140011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87 + ... + 7502.

Almost surely, 2^28140012 is an apocalyptic number.

It is an amenable number.

28140012 is an abundant number, since it is smaller than the sum of its proper divisors (43691748).

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

28140012 is a wasteful number, since it uses less digits than its factorization.

28140012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7702 (or 7697 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 28140012 is about 5304.7160150191. The cubic root of 28140012 is about 304.1641974237.

Adding to 28140012 its reverse (21004182), we get a palindrome (49144194).

The spelling of 28140012 in words is "twenty-eight million, one hundred forty thousand, twelve".