28713172 has 6 divisors (see below), whose sum is σ = 50248058. Its totient is φ = 14356584.

The previous prime is 28713169. The next prime is 28713173. The reversal of 28713172 is 27131782.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 8964036 = 4444^2 + 2994^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28713173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3589143 + ... + 3589150.

Almost surely, 2^28713172 is an apocalyptic number.

It is an amenable number.

28713172 is a deficient number, since it is larger than the sum of its proper divisors (21534886).

28713172 is a wasteful number, since it uses less digits than its factorization.

28713172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7178297 (or 7178295 counting only the distinct ones).

The product of its digits is 4704, while the sum is 31.

The square root of 28713172 is about 5358.4673181797. The cubic root of 28713172 is about 306.2154206688.

The spelling of 28713172 in words is "twenty-eight million, seven hundred thirteen thousand, one hundred seventy-two".