28939005 has 16 divisors (see below), whose sum is σ = 51447360. Its totient is φ = 15434064.

The previous prime is 28939003. The next prime is 28939019. The reversal of 28939005 is 50093982.

28939005 = T₁₅₇ + T₁₅₈ + ... + T₅₆₁.

It is not a de Polignac number, because 28939005 - 2¹ = 28939003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28939003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107047 + ... + 107316.

It is an arithmetic number, because the mean of its divisors is an integer number (3215460).

Almost surely, 2^28939005 is an apocalyptic number.

It is an amenable number.

28939005 is a deficient number, since it is larger than the sum of its proper divisors (22508355).

28939005 is a wasteful number, since it uses less digits than its factorization.

28939005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214377 (or 214371 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 28939005 is about 5379.4985825818. The cubic root of 28939005 is about 307.0161337176.

The spelling of 28939005 in words is "twenty-eight million, nine hundred thirty-nine thousand, five".