8721272 has 32 divisors (see below), whose sum is σ = 19789920. Its totient is φ = 3517440.

The previous prime is 8721269. The next prime is 8721281. The reversal of 8721272 is 2721278.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3629 + ... + 5532.

It is an arithmetic number, because the mean of its divisors is an integer number (618435).

Almost surely, 2^8721272 is an apocalyptic number.

It is an amenable number.

8721272 is an abundant number, since it is smaller than the sum of its proper divisors (11068648).

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

8721272 is a wasteful number, since it uses less digits than its factorization.

8721272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9191 (or 9187 counting only the distinct ones).

The product of its digits is 3136, while the sum is 29.

The square root of 8721272 is about 2953.1799809697. The cubic root of 8721272 is about 205.8385010022.

The spelling of 8721272 in words is "eight million, seven hundred twenty-one thousand, two hundred seventy-two".