28038691 has 2 divisors, whose sum is σ = 28038692. Its totient is φ = 28038690.

The previous prime is 28038683. The next prime is 28038697. The reversal of 28038691 is 19683082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28038691 - 2³ = 28038683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28038691.

It is not a weakly prime, because it can be changed into another prime (28038697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14019345 + 14019346.

It is an arithmetic number, because the mean of its divisors is an integer number (14019346).

Almost surely, 2^28038691 is an apocalyptic number.

28038691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28038691 is an equidigital number, since it uses as much as digits as its factorization.

28038691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28038691 is about 5295.1573158878. The cubic root of 28038691 is about 303.7987002701.

The spelling of 28038691 in words is "twenty-eight million, thirty-eight thousand, six hundred ninety-one".