28911919 has 2 divisors, whose sum is σ = 28911920. Its totient is φ = 28911918.

The previous prime is 28911899. The next prime is 28911941. The reversal of 28911919 is 91911982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28911919 - 2⁵ = 28911887 is a prime.

It is a super-2 number, since 2×28911919² = 1671798120525122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28911019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14455959 + 14455960.

It is an arithmetic number, because the mean of its divisors is an integer number (14455960).

Almost surely, 2^28911919 is an apocalyptic number.

28911919 is a deficient number, since it is larger than the sum of its proper divisors (1).

28911919 is an equidigital number, since it uses as much as digits as its factorization.

28911919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 40.

The square root of 28911919 is about 5376.9804723469. The cubic root of 28911919 is about 306.9203179976.

The spelling of 28911919 in words is "twenty-eight million, nine hundred eleven thousand, nine hundred nineteen".