28101132 has 18 divisors (see below), whose sum is σ = 71033508. Its totient is φ = 9367032.

The previous prime is 28101121. The next prime is 28101137. The reversal of 28101132 is 23110182.

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 not an unprimeable number, because it can be changed into a prime (28101137) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 390258 + ... + 390329.

It is an arithmetic number, because the mean of its divisors is an integer number (3946306).

Almost surely, 2^28101132 is an apocalyptic number.

It is an amenable number.

28101132 is an abundant number, since it is smaller than the sum of its proper divisors (42932376).

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

28101132 is a wasteful number, since it uses less digits than its factorization.

28101132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780597 (or 780592 counting only the distinct ones).

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

The square root of 28101132 is about 5301.0500846530. The cubic root of 28101132 is about 304.0240487669.

The spelling of 28101132 in words is "twenty-eight million, one hundred one thousand, one hundred thirty-two".