28113012 has 18 divisors (see below), whose sum is σ = 71063538. Its totient is φ = 9370992.

The previous prime is 28113011. The next prime is 28113037. The reversal of 28113012 is 21031182.

28113012 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in only one way, i.e., 22524516 + 5588496 = 4746^2 + 2364^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28113011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 390423 + ... + 390494.

Almost surely, 2^28113012 is an apocalyptic number.

It is an amenable number.

28113012 is an abundant number, since it is smaller than the sum of its proper divisors (42950526).

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

28113012 is a wasteful number, since it uses less digits than its factorization.

28113012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780927 (or 780922 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 28113012 is about 5302.1704989561. The cubic root of 28113012 is about 304.0668856753.

Adding to 28113012 its reverse (21031182), we get a palindrome (49144194).

The spelling of 28113012 in words is "twenty-eight million, one hundred thirteen thousand, twelve".