28401911 has 2 divisors, whose sum is σ = 28401912. Its totient is φ = 28401910.

The previous prime is 28401851. The next prime is 28401931. The reversal of 28401911 is 11910482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28401911 - 2⁶ = 28401847 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28401931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200955 + 14200956.

It is an arithmetic number, because the mean of its divisors is an integer number (14200956).

Almost surely, 2^28401911 is an apocalyptic number.

28401911 is a deficient number, since it is larger than the sum of its proper divisors (1).

28401911 is an equidigital number, since it uses as much as digits as its factorization.

28401911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 28401911 is about 5329.3443311537. The cubic root of 28401911 is about 305.1049034472.

The spelling of 28401911 in words is "twenty-eight million, four hundred one thousand, nine hundred eleven".