130646640 has 80 divisors (see below), whose sum is σ = 410607648. Its totient is φ = 34357248.

The previous prime is 130646629. The next prime is 130646701. The reversal of 130646640 is 46646031.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 130646598 and 130646607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13792 + ... + 21248.

Almost surely, 2^130646640 is an apocalyptic number.

130646640 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 130646640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205303824).

130646640 is an abundant number, since it is smaller than the sum of its proper divisors (279961008).

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

130646640 is a wasteful number, since it uses less digits than its factorization.

130646640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7546 (or 7540 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 130646640 is about 11430.0761152321. The cubic root of 130646640 is about 507.4182482146.

The spelling of 130646640 in words is "one hundred thirty million, six hundred forty-six thousand, six hundred forty".