8461728331 has 16 divisors (see below), whose sum is σ = 9908591616. Its totient is φ = 7075385856.

The previous prime is 8461728323. The next prime is 8461728343. The reversal of 8461728331 is 1338271648.

It is not a de Polignac number, because 8461728331 - 2³ = 8461728323 is a prime.

It is a super-2 number, since 2×8461728331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8461728371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59115 + ... + 142891.

It is an arithmetic number, because the mean of its divisors is an integer number (619286976).

Almost surely, 2^8461728331 is an apocalyptic number.

8461728331 is a deficient number, since it is larger than the sum of its proper divisors (1446863285).

8461728331 is a wasteful number, since it uses less digits than its factorization.

8461728331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84138.

The product of its digits is 193536, while the sum is 43.

The square root of 8461728331 is about 91987.6531443215. The cubic root of 8461728331 is about 2037.7599668091.

Adding to 8461728331 its reverse (1338271648), we get a palindrome (9799999979).

The spelling of 8461728331 in words is "eight billion, four hundred sixty-one million, seven hundred twenty-eight thousand, three hundred thirty-one".