28102101 has 8 divisors (see below), whose sum is σ = 37513920. Its totient is φ = 18712512.

The previous prime is 28102051. The next prime is 28102103. The reversal of 28102101 is 10120182.

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

It is not a de Polignac number, because 28102101 - 2¹⁸ = 27839957 is a prime.

It is a super-2 number, since 2×28102101² = 1579456161228402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102103) 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, 2340 + ... + 7853.

It is an arithmetic number, because the mean of its divisors is an integer number (4689240).

Almost surely, 2^28102101 is an apocalyptic number.

It is an amenable number.

28102101 is a deficient number, since it is larger than the sum of its proper divisors (9411819).

28102101 is a wasteful number, since it uses less digits than its factorization.

28102101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11115.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 28102101 is about 5301.1414808511. The cubic root of 28102101 is about 304.0275432397.

Adding to 28102101 its reverse (10120182), we get a palindrome (38222283).

It can be divided in two parts, 28102 and 101, that added together give a triangular number (28203 = T₂₃₇).

The spelling of 28102101 in words is "twenty-eight million, one hundred two thousand, one hundred one".