28490993 has 2 divisors, whose sum is σ = 28490994. Its totient is φ = 28490992.

The previous prime is 28490981. The next prime is 28491017. The reversal of 28490993 is 39909482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27384289 + 1106704 = 5233^2 + 1052^2 .

It is a cyclic number.

It is not a de Polignac number, because 28490993 - 2¹⁰ = 28489969 is a prime.

It is not a weakly prime, because it can be changed into another prime (28490593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14245496 + 14245497.

It is an arithmetic number, because the mean of its divisors is an integer number (14245497).

Almost surely, 2^28490993 is an apocalyptic number.

It is an amenable number.

28490993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28490993 is an equidigital number, since it uses as much as digits as its factorization.

28490993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 28490993 is about 5337.6954765142. The cubic root of 28490993 is about 305.4235555805.

The spelling of 28490993 in words is "twenty-eight million, four hundred ninety thousand, nine hundred ninety-three".