28911039 has 4 divisors (see below), whose sum is σ = 38548056. Its totient is φ = 19274024.

The previous prime is 28911037. The next prime is 28911041. The reversal of 28911039 is 93011982.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28911037) and next prime (28911041).

It is a cyclic number.

It is not a de Polignac number, because 28911039 - 2¹ = 28911037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28911031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4818504 + ... + 4818509.

It is an arithmetic number, because the mean of its divisors is an integer number (9637014).

Almost surely, 2^28911039 is an apocalyptic number.

28911039 is a deficient number, since it is larger than the sum of its proper divisors (9637017).

28911039 is an equidigital number, since it uses as much as digits as its factorization.

28911039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9637016.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 28911039 is about 5376.8986414103. The cubic root of 28911039 is about 306.9172040268.

The spelling of 28911039 in words is "twenty-eight million, nine hundred eleven thousand, thirty-nine".