28312693 has 2 divisors, whose sum is σ = 28312694. Its totient is φ = 28312692.

The previous prime is 28312681. The next prime is 28312699. The reversal of 28312693 is 39621382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19562929 + 8749764 = 4423^2 + 2958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28312693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28312699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14156346 + 14156347.

It is an arithmetic number, because the mean of its divisors is an integer number (14156347).

Almost surely, 2^28312693 is an apocalyptic number.

It is an amenable number.

28312693 is a deficient number, since it is larger than the sum of its proper divisors (1).

28312693 is an equidigital number, since it uses as much as digits as its factorization.

28312693 is an evil number, because the sum of its binary digits is even.

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

The square root of 28312693 is about 5320.9672992793. The cubic root of 28312693 is about 304.7850963072.

The spelling of 28312693 in words is "twenty-eight million, three hundred twelve thousand, six hundred ninety-three".