28164939 has 16 divisors (see below), whose sum is σ = 41157120. Its totient is φ = 16990560.

The previous prime is 28164883. The next prime is 28164953. The reversal of 28164939 is 93946182.

It is not a de Polignac number, because 28164939 - 2²¹ = 26067787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28164939.

It is not an unprimeable number, because it can be changed into a prime (28164959) 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, 5694 + ... + 9420.

It is an arithmetic number, because the mean of its divisors is an integer number (2572320).

Almost surely, 2^28164939 is an apocalyptic number.

28164939 is a deficient number, since it is larger than the sum of its proper divisors (12992181).

28164939 is a wasteful number, since it uses less digits than its factorization.

28164939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970.

The product of its digits is 93312, while the sum is 42.

The square root of 28164939 is about 5307.0650080812. The cubic root of 28164939 is about 304.2539825467.

The spelling of 28164939 in words is "twenty-eight million, one hundred sixty-four thousand, nine hundred thirty-nine".