28113642 has 24 divisors (see below), whose sum is σ = 63170016. Its totient is φ = 9371052.

The previous prime is 28113641. The next prime is 28113667. The reversal of 28113642 is 24631182.

28113642 is a `hidden beast` number, since 2 + 8 + 1 + 13 + 642 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28113641) 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, 28438 + ... + 29409.

It is an arithmetic number, because the mean of its divisors is an integer number (2632084).

Almost surely, 2^28113642 is an apocalyptic number.

28113642 is an abundant number, since it is smaller than the sum of its proper divisors (35056374).

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

28113642 is an equidigital number, since it uses as much as digits as its factorization.

28113642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57864 (or 57852 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 28113642 is about 5302.2299082556. The cubic root of 28113642 is about 304.0691569925.

The spelling of 28113642 in words is "twenty-eight million, one hundred thirteen thousand, six hundred forty-two".