28731433 has 2 divisors, whose sum is σ = 28731434. Its totient is φ = 28731432.

The previous prime is 28731403. The next prime is 28731449. The reversal of 28731433 is 33413782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28217344 + 514089 = 5312^2 + 717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28731433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28731395 and 28731404.

It is not a weakly prime, because it can be changed into another prime (28731403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365716 + 14365717.

It is an arithmetic number, because the mean of its divisors is an integer number (14365717).

Almost surely, 2^28731433 is an apocalyptic number.

It is an amenable number.

28731433 is a deficient number, since it is larger than the sum of its proper divisors (1).

28731433 is an equidigital number, since it uses as much as digits as its factorization.

28731433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 28731433 is about 5360.1709860787. The cubic root of 28731433 is about 306.2803225286.

The spelling of 28731433 in words is "twenty-eight million, seven hundred thirty-one thousand, four hundred thirty-three".