28911403 has 2 divisors, whose sum is σ = 28911404. Its totient is φ = 28911402.

The previous prime is 28911397. The next prime is 28911433. The reversal of 28911403 is 30411982.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28911403 - 2¹³ = 28903211 is a prime.

It is not a weakly prime, because it can be changed into another prime (28911433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14455701 + 14455702.

It is an arithmetic number, because the mean of its divisors is an integer number (14455702).

Almost surely, 2^28911403 is an apocalyptic number.

28911403 is a deficient number, since it is larger than the sum of its proper divisors (1).

28911403 is an equidigital number, since it uses as much as digits as its factorization.

28911403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28911403 is about 5376.9324898124. The cubic root of 28911403 is about 306.9184920860.

The spelling of 28911403 in words is "twenty-eight million, nine hundred eleven thousand, four hundred three".