28587331 has 2 divisors, whose sum is σ = 28587332. Its totient is φ = 28587330.

The previous prime is 28587323. The next prime is 28587337. The reversal of 28587331 is 13378582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28587331 - 2³ = 28587323 is a prime.

It is a super-2 number, since 2×28587331² = 1634470987407122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28587337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14293665 + 14293666.

It is an arithmetic number, because the mean of its divisors is an integer number (14293666).

Almost surely, 2^28587331 is an apocalyptic number.

28587331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28587331 is an equidigital number, since it uses as much as digits as its factorization.

28587331 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 28587331 is about 5346.7121673043. The cubic root of 28587331 is about 305.7674162116.

It can be divided in two parts, 285 and 87331, that added together give a square (87616 = 296²).

The spelling of 28587331 in words is "twenty-eight million, five hundred eighty-seven thousand, three hundred thirty-one".