28272101 has 16 divisors (see below), whose sum is σ = 33407808. Its totient is φ = 23587200.

The previous prime is 28272073. The next prime is 28272103. The reversal of 28272101 is 10127282.

It is a de Polignac number, because none of the positive numbers 2^k-28272101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28272103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29705 + ... + 30641.

It is an arithmetic number, because the mean of its divisors is an integer number (2087988).

Almost surely, 2^28272101 is an apocalyptic number.

It is an amenable number.

28272101 is a deficient number, since it is larger than the sum of its proper divisors (5135707).

28272101 is a wasteful number, since it uses less digits than its factorization.

28272101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 28272101 is about 5317.1515870812. The cubic root of 28272101 is about 304.6393695142.

Adding to 28272101 its reverse (10127282), we get a palindrome (38399383).

The spelling of 28272101 in words is "twenty-eight million, two hundred seventy-two thousand, one hundred one".