8131280 has 20 divisors (see below), whose sum is σ = 18905412. Its totient is φ = 3252480.

The previous prime is 8131271. The next prime is 8131309. The reversal of 8131280 is 821318.

It can be written as a sum of positive squares in 2 ways, for example, as 1308736 + 6822544 = 1144^2 + 2612^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×8131280² = 132235428876800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50741 + ... + 50900.

Almost surely, 2^8131280 is an apocalyptic number.

8131280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8131280 is an abundant number, since it is smaller than the sum of its proper divisors (10774132).

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

8131280 is a wasteful number, since it uses less digits than its factorization.

8131280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101654 (or 101648 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 8131280 is about 2851.5399348422. The cubic root of 8131280 is about 201.0880697860.

Adding to 8131280 its reverse (821318), we get a palindrome (8952598).

The spelling of 8131280 in words is "eight million, one hundred thirty-one thousand, two hundred eighty".