28207693 has 2 divisors, whose sum is σ = 28207694. Its totient is φ = 28207692.

The previous prime is 28207651. The next prime is 28207717. The reversal of 28207693 is 39670282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28015849 + 191844 = 5293^2 + 438^2 .

It is a cyclic number.

It is not a de Polignac number, because 28207693 - 2⁹ = 28207181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28207643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14103846 + 14103847.

It is an arithmetic number, because the mean of its divisors is an integer number (14103847).

Almost surely, 2^28207693 is an apocalyptic number.

It is an amenable number.

28207693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28207693 is an equidigital number, since it uses as much as digits as its factorization.

28207693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 28207693 is about 5311.0915074022. The cubic root of 28207693 is about 304.4078558699.

It can be divided in two parts, 28207 and 693, that added together give a square (28900 = 170²).

The spelling of 28207693 in words is "twenty-eight million, two hundred seven thousand, six hundred ninety-three".