28940705 has 16 divisors (see below), whose sum is σ = 36702720. Its totient is φ = 21846528.

The previous prime is 28940687. The next prime is 28940707. The reversal of 28940705 is 50704982.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28940705 - 2¹⁴ = 28924321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28940707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33104 + ... + 33966.

It is an arithmetic number, because the mean of its divisors is an integer number (2293920).

Almost surely, 2^28940705 is an apocalyptic number.

It is an amenable number.

28940705 is a deficient number, since it is larger than the sum of its proper divisors (7762015).

28940705 is a wasteful number, since it uses less digits than its factorization.

28940705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28940705 is about 5379.6565875528. The cubic root of 28940705 is about 307.0221454103.

The spelling of 28940705 in words is "twenty-eight million, nine hundred forty thousand, seven hundred five".