28405071 has 12 divisors (see below), whose sum is σ = 41216448. Its totient is φ = 18850464.

The previous prime is 28405051. The next prime is 28405093. The reversal of 28405071 is 17050482.

It is not a de Polignac number, because 28405071 - 2⁹ = 28404559 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28405001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5070 + ... + 9083.

It is an arithmetic number, because the mean of its divisors is an integer number (3434704).

Almost surely, 2^28405071 is an apocalyptic number.

28405071 is a deficient number, since it is larger than the sum of its proper divisors (12811377).

28405071 is a wasteful number, since it uses less digits than its factorization.

28405071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14382 (or 14379 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 28405071 is about 5329.6407946502. The cubic root of 28405071 is about 305.1162183635.

The spelling of 28405071 in words is "twenty-eight million, four hundred five thousand, seventy-one".