28631293 has 2 divisors, whose sum is σ = 28631294. Its totient is φ = 28631292.

The previous prime is 28631287. The next prime is 28631333. The reversal of 28631293 is 39213682.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27436644 + 1194649 = 5238^2 + 1093^2 .

It is a cyclic number.

It is not a de Polignac number, because 28631293 - 2²¹ = 26534141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28631203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14315646 + 14315647.

It is an arithmetic number, because the mean of its divisors is an integer number (14315647).

Almost surely, 2^28631293 is an apocalyptic number.

It is an amenable number.

28631293 is a deficient number, since it is larger than the sum of its proper divisors (1).

28631293 is an equidigital number, since it uses as much as digits as its factorization.

28631293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 28631293 is about 5350.8217125970. The cubic root of 28631293 is about 305.9240737478.

The spelling of 28631293 in words is "twenty-eight million, six hundred thirty-one thousand, two hundred ninety-three".