28749449 has 2 divisors, whose sum is σ = 28749450. Its totient is φ = 28749448.

The previous prime is 28749421. The next prime is 28749467. The reversal of 28749449 is 94494782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28430224 + 319225 = 5332^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 28749449 - 2²⁰ = 27700873 is a prime.

It is not a weakly prime, because it can be changed into another prime (28749419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14374724 + 14374725.

It is an arithmetic number, because the mean of its divisors is an integer number (14374725).

Almost surely, 2^28749449 is an apocalyptic number.

It is an amenable number.

28749449 is a deficient number, since it is larger than the sum of its proper divisors (1).

28749449 is an equidigital number, since it uses as much as digits as its factorization.

28749449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 28749449 is about 5361.8512661207. The cubic root of 28749449 is about 306.3443266845.

The spelling of 28749449 in words is "twenty-eight million, seven hundred forty-nine thousand, four hundred forty-nine".