28049091 has 16 divisors (see below), whose sum is σ = 42818304. Its totient is φ = 15999264.

The previous prime is 28049069. The next prime is 28049107. The reversal of 28049091 is 19094082.

It is not a de Polignac number, because 28049091 - 2⁵ = 28049059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28049011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17656 + ... + 19178.

It is an arithmetic number, because the mean of its divisors is an integer number (2676144).

Almost surely, 2^28049091 is an apocalyptic number.

28049091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28049091 is a deficient number, since it is larger than the sum of its proper divisors (14769213).

28049091 is a wasteful number, since it uses less digits than its factorization.

28049091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 28049091 is about 5296.1392542115. The cubic root of 28049091 is about 303.8362568964.

The spelling of 28049091 in words is "twenty-eight million, forty-nine thousand, ninety-one".