130840720 has 20 divisors (see below), whose sum is σ = 304204860. Its totient is φ = 52336256.

The previous prime is 130840693. The next prime is 130840727. The reversal of 130840720 is 27048031.

It can be written as a sum of positive squares in 2 ways, for example, as 25080064 + 105760656 = 5008^2 + 10284^2 .

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

It is not an unprimeable number, because it can be changed into a prime (130840727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817675 + ... + 817834.

It is an arithmetic number, because the mean of its divisors is an integer number (15210243).

Almost surely, 2^130840720 is an apocalyptic number.

130840720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130840720 is an abundant number, since it is smaller than the sum of its proper divisors (173364140).

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

130840720 is a wasteful number, since it uses less digits than its factorization.

130840720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635522 (or 1635516 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 130840720 is about 11438.5628467915. The cubic root of 130840720 is about 507.6693862176.

Adding to 130840720 its reverse (27048031), we get a palindrome (157888751).

The spelling of 130840720 in words is "one hundred thirty million, eight hundred forty thousand, seven hundred twenty".