28002101 has 2 divisors, whose sum is σ = 28002102. Its totient is φ = 28002100.

The previous prime is 28002097. The next prime is 28002113. The reversal of 28002101 is 10120082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22944100 + 5058001 = 4790^2 + 2249^2 .

It is a cyclic number.

It is not a de Polignac number, because 28002101 - 2² = 28002097 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28002131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14001050 + 14001051.

It is an arithmetic number, because the mean of its divisors is an integer number (14001051).

Almost surely, 2^28002101 is an apocalyptic number.

It is an amenable number.

28002101 is a deficient number, since it is larger than the sum of its proper divisors (1).

28002101 is an equidigital number, since it uses as much as digits as its factorization.

28002101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 28002101 is about 5291.7011442446. The cubic root of 28002101 is about 303.6664920850. Note that the first 3 decimals are identical.

Adding to 28002101 its reverse (10120082), we get a palindrome (38122183).

The spelling of 28002101 in words is "twenty-eight million, two thousand, one hundred one".