28491193 has 2 divisors, whose sum is σ = 28491194. Its totient is φ = 28491192.

The previous prime is 28491179. The next prime is 28491223. The reversal of 28491193 is 39119482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27426169 + 1065024 = 5237^2 + 1032^2 .

It is a cyclic number.

It is not a de Polignac number, because 28491193 - 2¹⁷ = 28360121 is a prime.

It is not a weakly prime, because it can be changed into another prime (28491103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14245596 + 14245597.

It is an arithmetic number, because the mean of its divisors is an integer number (14245597).

Almost surely, 2^28491193 is an apocalyptic number.

It is an amenable number.

28491193 is a deficient number, since it is larger than the sum of its proper divisors (1).

28491193 is an equidigital number, since it uses as much as digits as its factorization.

28491193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 28491193 is about 5337.7142111582. The cubic root of 28491193 is about 305.4242702458.

The spelling of 28491193 in words is "twenty-eight million, four hundred ninety-one thousand, one hundred ninety-three".