28273791 has 16 divisors (see below), whose sum is σ = 46398464. Its totient is φ = 14913504.

The previous prime is 28273769. The next prime is 28273841. The reversal of 28273791 is 19737282.

It is not a de Polignac number, because 28273791 - 2⁶ = 28273727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28273711) 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, 51511 + ... + 52056.

It is an arithmetic number, because the mean of its divisors is an integer number (2899904).

Almost surely, 2^28273791 is an apocalyptic number.

28273791 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28273791 is a deficient number, since it is larger than the sum of its proper divisors (18124673).

28273791 is a wasteful number, since it uses less digits than its factorization.

28273791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103590.

The product of its digits is 42336, while the sum is 39.

The square root of 28273791 is about 5317.3105043810. The cubic root of 28273791 is about 304.6454394590.

The spelling of 28273791 in words is "twenty-eight million, two hundred seventy-three thousand, seven hundred ninety-one".