8731040 has 48 divisors (see below), whose sum is σ = 20806632. Its totient is φ = 3462144.

The previous prime is 8731039. The next prime is 8731069. The reversal of 8731040 is 401378.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7862416 + 868624 = 2804^2 + 932^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8730997 and 8731015.

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, 31382 + ... + 31658.

Almost surely, 2^8731040 is an apocalyptic number.

8731040 is a gapful number since it is divisible by the number (80) 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 8731040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10403316).

8731040 is an abundant number, since it is smaller than the sum of its proper divisors (12075592).

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

8731040 is a wasteful number, since it uses less digits than its factorization.

8731040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 8731040 is about 2954.8333286329. The cubic root of 8731040 is about 205.9153200830.

The spelling of 8731040 in words is "eight million, seven hundred thirty-one thousand, forty".