28842991 has 2 divisors, whose sum is σ = 28842992. Its totient is φ = 28842990.

The previous prime is 28842977. The next prime is 28842997. The reversal of 28842991 is 19924882.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28842991 - 2⁵ = 28842959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28842997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14421495 + 14421496.

It is an arithmetic number, because the mean of its divisors is an integer number (14421496).

Almost surely, 2^28842991 is an apocalyptic number.

28842991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28842991 is an equidigital number, since it uses as much as digits as its factorization.

28842991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 43.

The square root of 28842991 is about 5370.5671022714. The cubic root of 28842991 is about 306.6762175402.

The spelling of 28842991 in words is "twenty-eight million, eight hundred forty-two thousand, nine hundred ninety-one".