28731893 has 2 divisors, whose sum is σ = 28731894. Its totient is φ = 28731892.

The previous prime is 28731881. The next prime is 28731917. The reversal of 28731893 is 39813782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28654609 + 77284 = 5353^2 + 278^2 .

It is a cyclic number.

It is not a de Polignac number, because 28731893 - 2⁴ = 28731877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28731893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28731803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365946 + 14365947.

It is an arithmetic number, because the mean of its divisors is an integer number (14365947).

Almost surely, 2^28731893 is an apocalyptic number.

It is an amenable number.

28731893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28731893 is an equidigital number, since it uses as much as digits as its factorization.

28731893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 28731893 is about 5360.2138949859. The cubic root of 28731893 is about 306.2819570706.

The spelling of 28731893 in words is "twenty-eight million, seven hundred thirty-one thousand, eight hundred ninety-three".