28001693 has 2 divisors, whose sum is σ = 28001694. Its totient is φ = 28001692.

The previous prime is 28001671. The next prime is 28001713. The reversal of 28001693 is 39610082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14730244 + 13271449 = 3838^2 + 3643^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28001693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28001093) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000846 + 14000847.

It is an arithmetic number, because the mean of its divisors is an integer number (14000847).

Almost surely, 2^28001693 is an apocalyptic number.

It is an amenable number.

28001693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28001693 is an equidigital number, since it uses as much as digits as its factorization.

28001693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 28001693 is about 5291.6625931743. The cubic root of 28001693 is about 303.6650172370.

The spelling of 28001693 in words is "twenty-eight million, one thousand, six hundred ninety-three".