28242691 has 2 divisors, whose sum is σ = 28242692. Its totient is φ = 28242690.

The previous prime is 28242673. The next prime is 28242713. The reversal of 28242691 is 19624282.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28242691 is a prime.

It is not a weakly prime, because it can be changed into another prime (28242601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121345 + 14121346.

It is an arithmetic number, because the mean of its divisors is an integer number (14121346).

Almost surely, 2^28242691 is an apocalyptic number.

28242691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28242691 is an equidigital number, since it uses as much as digits as its factorization.

28242691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 28242691 is about 5314.3852890057. The cubic root of 28242691 is about 304.5336993539.

The spelling of 28242691 in words is "twenty-eight million, two hundred forty-two thousand, six hundred ninety-one".