28049005 has 16 divisors (see below), whose sum is σ = 34320384. Its totient is φ = 22003200.

The previous prime is 28048981. The next prime is 28049011. The reversal of 28049005 is 50094082.

It is a happy number.

It is not a de Polignac number, because 28049005 - 2¹⁷ = 27917933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73044 + ... + 73426.

It is an arithmetic number, because the mean of its divisors is an integer number (2145024).

Almost surely, 2^28049005 is an apocalyptic number.

It is an amenable number.

28049005 is a deficient number, since it is larger than the sum of its proper divisors (6271379).

28049005 is a wasteful number, since it uses less digits than its factorization.

28049005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 28049005 is about 5296.1311350834. The cubic root of 28049005 is about 303.8359463701.

The spelling of 28049005 in words is "twenty-eight million, forty-nine thousand, five".