28785331 has 2 divisors, whose sum is σ = 28785332. Its totient is φ = 28785330.

The previous prime is 28785293. The next prime is 28785347. The reversal of 28785331 is 13358782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28785331 - 2¹³ = 28777139 is a prime.

It is a super-2 number, since 2×28785331² = 1657190561559122, which contains 22 as substring.

It is equal to p_1787194 and since 28785331 and 1787194 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28780331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392665 + 14392666.

It is an arithmetic number, because the mean of its divisors is an integer number (14392666).

Almost surely, 2^28785331 is an apocalyptic number.

28785331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785331 is an equidigital number, since it uses as much as digits as its factorization.

28785331 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 28785331 is about 5365.1962685441. The cubic root of 28785331 is about 306.4717224847.

The spelling of 28785331 in words is "twenty-eight million, seven hundred eighty-five thousand, three hundred thirty-one".