28581023 has 2 divisors, whose sum is σ = 28581024. Its totient is φ = 28581022.

The previous prime is 28581017. The next prime is 28581043. The reversal of 28581023 is 32018582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28581023 - 2¹² = 28576927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28581013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14290511 + 14290512.

It is an arithmetic number, because the mean of its divisors is an integer number (14290512).

Almost surely, 2^28581023 is an apocalyptic number.

28581023 is a deficient number, since it is larger than the sum of its proper divisors (1).

28581023 is an equidigital number, since it uses as much as digits as its factorization.

28581023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 28581023 is about 5346.1222395303. The cubic root of 28581023 is about 305.7449246314.

The spelling of 28581023 in words is "twenty-eight million, five hundred eighty-one thousand, twenty-three".