130501640 has 32 divisors (see below), whose sum is σ = 293955480. Its totient is φ = 52142592.

The previous prime is 130501597. The next prime is 130501663. The reversal of 130501640 is 46105031.

It can be written as a sum of positive squares in 4 ways, for example, as 82919236 + 47582404 = 9106^2 + 6898^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 64484 + ... + 66476.

Almost surely, 2^130501640 is an apocalyptic number.

130501640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130501640 is an abundant number, since it is smaller than the sum of its proper divisors (163453840).

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

130501640 is a wasteful number, since it uses less digits than its factorization.

130501640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641 (or 3637 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 130501640 is about 11423.7314394203. The cubic root of 130501640 is about 507.2304569775.

Adding to 130501640 its reverse (46105031), we get a palindrome (176606671).

The spelling of 130501640 in words is "one hundred thirty million, five hundred one thousand, six hundred forty".