28971272 has 36 divisors (see below), whose sum is σ = 60055485. Its totient is φ = 13092640.

The previous prime is 28971263. The next prime is 28971287. The reversal of 28971272 is 27217982.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 22791076 + 6180196 = 4774^2 + 2486^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3806.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 167378 + ... + 167550.

Almost surely, 2^28971272 is an apocalyptic number.

28971272 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28971272

28971272 is an abundant number, since it is smaller than the sum of its proper divisors (31084213).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28971272 is a wasteful number, since it uses less digits than its factorization.

28971272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 186 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 28971272 is about 5382.4968183920. The cubic root of 28971272 is about 307.1301990302.

The spelling of 28971272 in words is "twenty-eight million, nine hundred seventy-one thousand, two hundred seventy-two".