28727101 has 8 divisors (see below), whose sum is σ = 31692024. Its totient is φ = 25870080.

The previous prime is 28727087. The next prime is 28727117. The reversal of 28727101 is 10172782.

It can be written as a sum of positive squares in 4 ways, for example, as 51076 + 28676025 = 226^2 + 5355^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28727101 - 2⁹ = 28726589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28727101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28727191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26416 + ... + 27481.

It is an arithmetic number, because the mean of its divisors is an integer number (3961503).

Almost surely, 2^28727101 is an apocalyptic number.

It is an amenable number.

28727101 is a deficient number, since it is larger than the sum of its proper divisors (2964923).

28727101 is a wasteful number, since it uses less digits than its factorization.

28727101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53951.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 28727101 is about 5359.7668792588. The cubic root of 28727101 is about 306.2649285517.

Adding to 28727101 its reverse (10172782), we get a palindrome (38899883).

The spelling of 28727101 in words is "twenty-eight million, seven hundred twenty-seven thousand, one hundred one".