28071101 has 8 divisors (see below), whose sum is σ = 29748600. Its totient is φ = 26440960.

The previous prime is 28071091. The next prime is 28071103. The reversal of 28071101 is 10117082.

It can be written as a sum of positive squares in 4 ways, for example, as 139876 + 27931225 = 374^2 + 5285^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28071101 is a prime.

It is a super-2 number, since 2×28071101² = 1575973422704402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071103) 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, 10616 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (3718575).

Almost surely, 2^28071101 is an apocalyptic number.

It is an amenable number.

28071101 is a deficient number, since it is larger than the sum of its proper divisors (1677499).

28071101 is a wasteful number, since it uses less digits than its factorization.

28071101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23679.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 28071101 is about 5298.2167754821. The cubic root of 28071101 is about 303.9157091156.

Adding to 28071101 its reverse (10117082), we get a palindrome (38188183).

The spelling of 28071101 in words is "twenty-eight million, seventy-one thousand, one hundred one".