8728231 has 4 divisors (see below), whose sum is σ = 8735464. Its totient is φ = 8721000.

The previous prime is 8728211. The next prime is 8728241. The reversal of 8728231 is 1328278.

8728231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8728231 - 2¹⁷ = 8597159 is a prime.

It is a super-2 number, since 2×8728231² = 152364032778722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 8728193 and 8728202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8728211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1320 + ... + 4381.

It is an arithmetic number, because the mean of its divisors is an integer number (2183866).

Almost surely, 2^8728231 is an apocalyptic number.

8728231 is the 1869-th centered pentagonal number.

8728231 is a deficient number, since it is larger than the sum of its proper divisors (7233).

8728231 is a wasteful number, since it uses less digits than its factorization.

8728231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7232.

The product of its digits is 5376, while the sum is 31.

The square root of 8728231 is about 2954.3579674779. The cubic root of 8728231 is about 205.8932349638.

The spelling of 8728231 in words is "eight million, seven hundred twenty-eight thousand, two hundred thirty-one".