28011149 has 4 divisors (see below), whose sum is σ = 29485440. Its totient is φ = 26536860.

The previous prime is 28011143. The next prime is 28011161. The reversal of 28011149 is 94111082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28011149 - 2⁸ = 28010893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28011143) 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, 737117 + ... + 737154.

It is an arithmetic number, because the mean of its divisors is an integer number (7371360).

Almost surely, 2^28011149 is an apocalyptic number.

It is an amenable number.

28011149 is a deficient number, since it is larger than the sum of its proper divisors (1474291).

28011149 is a wasteful number, since it uses less digits than its factorization.

28011149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474290.

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

The square root of 28011149 is about 5292.5559987590. Note that the first 3 decimals coincide. The cubic root of 28011149 is about 303.6991953280.

The spelling of 28011149 in words is "twenty-eight million, eleven thousand, one hundred forty-nine".