28812149 has 2 divisors, whose sum is σ = 28812150. Its totient is φ = 28812148.

The previous prime is 28812137. The next prime is 28812163. The reversal of 28812149 is 94121882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28143025 + 669124 = 5305^2 + 818^2 .

It is a cyclic number.

It is not a de Polignac number, because 28812149 - 2²⁴ = 12034933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28812349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14406074 + 14406075.

It is an arithmetic number, because the mean of its divisors is an integer number (14406075).

Almost surely, 2^28812149 is an apocalyptic number.

It is an amenable number.

28812149 is a deficient number, since it is larger than the sum of its proper divisors (1).

28812149 is an equidigital number, since it uses as much as digits as its factorization.

28812149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 35.

The square root of 28812149 is about 5367.6949428968. The cubic root of 28812149 is about 306.5668682561.

The spelling of 28812149 in words is "twenty-eight million, eight hundred twelve thousand, one hundred forty-nine".