28812101 has 2 divisors, whose sum is σ = 28812102. Its totient is φ = 28812100.

The previous prime is 28812097. The next prime is 28812137. The reversal of 28812101 is 10121882.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22335076 + 6477025 = 4726^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 28812101 - 2² = 28812097 is a prime.

It is a super-4 number, since 4×28812101⁴ (a number of 31 digits) contains 4444 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28812181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14406050 + 14406051.

It is an arithmetic number, because the mean of its divisors is an integer number (14406051).

Almost surely, 2^28812101 is an apocalyptic number.

It is an amenable number.

28812101 is a deficient number, since it is larger than the sum of its proper divisors (1).

28812101 is an equidigital number, since it uses as much as digits as its factorization.

28812101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 28812101 is about 5367.6904717020. The cubic root of 28812101 is about 306.5666980128.

Adding to 28812101 its reverse (10121882), we get a palindrome (38933983).

The spelling of 28812101 in words is "twenty-eight million, eight hundred twelve thousand, one hundred one".