28273949 has 6 divisors (see below), whose sum is σ = 31078110. Its totient is φ = 25703480.

The previous prime is 28273937. The next prime is 28273951. The reversal of 28273949 is 94937282.

It can be written as a sum of positive squares in only one way, i.e., 26728900 + 1545049 = 5170^2 + 1243^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28273949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28273249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116714 + ... + 116955.

It is an arithmetic number, because the mean of its divisors is an integer number (5179685).

Almost surely, 2^28273949 is an apocalyptic number.

It is an amenable number.

28273949 is a deficient number, since it is larger than the sum of its proper divisors (2804161).

28273949 is a wasteful number, since it uses less digits than its factorization.

28273949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233691 (or 233680 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 28273949 is about 5317.3253614952. The cubic root of 28273949 is about 304.6460069326.

It can be divided in two parts, 2827 and 3949, that added together give a palindrome (6776).

The spelling of 28273949 in words is "twenty-eight million, two hundred seventy-three thousand, nine hundred forty-nine".