28742873 has 2 divisors, whose sum is σ = 28742874. Its totient is φ = 28742872.

The previous prime is 28742867. The next prime is 28742887. The reversal of 28742873 is 37824782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27175369 + 1567504 = 5213^2 + 1252^2 .

It is a cyclic number.

It is not a de Polignac number, because 28742873 - 2¹² = 28738777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28742873.

It is not a weakly prime, because it can be changed into another prime (28742843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14371436 + 14371437.

It is an arithmetic number, because the mean of its divisors is an integer number (14371437).

Almost surely, 2^28742873 is an apocalyptic number.

It is an amenable number.

28742873 is a deficient number, since it is larger than the sum of its proper divisors (1).

28742873 is an equidigital number, since it uses as much as digits as its factorization.

28742873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 41.

The square root of 28742873 is about 5361.2380100122. The cubic root of 28742873 is about 306.3209676988.

The spelling of 28742873 in words is "twenty-eight million, seven hundred forty-two thousand, eight hundred seventy-three".