130640720 has 80 divisors (see below), whose sum is σ = 351644160. Its totient is φ = 44209152.

The previous prime is 130640717. The next prime is 130640729. The reversal of 130640720 is 27046031.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130640729) 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, 42764 + ... + 45716.

It is an arithmetic number, because the mean of its divisors is an integer number (4395552).

Almost surely, 2^130640720 is an apocalyptic number.

130640720 is a gapful number since it is divisible by the number (10) 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 130640720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175822080).

130640720 is an abundant number, since it is smaller than the sum of its proper divisors (221003440).

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

130640720 is a wasteful number, since it uses less digits than its factorization.

130640720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052 (or 3046 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 130640720 is about 11429.8171463939. The cubic root of 130640720 is about 507.4105838730.

Adding to 130640720 its reverse (27046031), we get a palindrome (157686751).

The spelling of 130640720 in words is "one hundred thirty million, six hundred forty thousand, seven hundred twenty".