28707493 has 2 divisors, whose sum is σ = 28707494. Its totient is φ = 28707492.

The previous prime is 28707487. The next prime is 28707517. The reversal of 28707493 is 39470782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15984004 + 12723489 = 3998^2 + 3567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28707493 is a prime.

It is equal to p_1782679 and since 28707493 and 1782679 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28707433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14353746 + 14353747.

It is an arithmetic number, because the mean of its divisors is an integer number (14353747).

Almost surely, 2^28707493 is an apocalyptic number.

It is an amenable number.

28707493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28707493 is an equidigital number, since it uses as much as digits as its factorization.

28707493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 28707493 is about 5357.9373829861. The cubic root of 28707493 is about 306.1952311888.

The spelling of 28707493 in words is "twenty-eight million, seven hundred seven thousand, four hundred ninety-three".