28731583 has 2 divisors, whose sum is σ = 28731584. Its totient is φ = 28731582.

The previous prime is 28731569. The next prime is 28731601. The reversal of 28731583 is 38513782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28731583 - 2⁵ = 28731551 is a prime.

It is equal to p_1784089 and since 28731583 and 1784089 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28731383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14365791 + 14365792.

It is an arithmetic number, because the mean of its divisors is an integer number (14365792).

Almost surely, 2^28731583 is an apocalyptic number.

28731583 is a deficient number, since it is larger than the sum of its proper divisors (1).

28731583 is an equidigital number, since it uses as much as digits as its factorization.

28731583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 28731583 is about 5360.1849781514. The cubic root of 28731583 is about 306.2808555333.

The spelling of 28731583 in words is "twenty-eight million, seven hundred thirty-one thousand, five hundred eighty-three".