130656440 has 32 divisors (see below), whose sum is σ = 294446880. Its totient is φ = 52179072.

The previous prime is 130656439. The next prime is 130656443. The reversal of 130656440 is 44656031.

It is a happy number.

It is a super-2 number, since 2×130656440² = 34142210626947200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130656443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26834 + ... + 31326.

It is an arithmetic number, because the mean of its divisors is an integer number (9201465).

Almost surely, 2^130656440 is an apocalyptic number.

130656440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130656440 is an abundant number, since it is smaller than the sum of its proper divisors (163790440).

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

130656440 is a wasteful number, since it uses less digits than its factorization.

130656440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5231 (or 5227 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 130656440 is about 11430.5048007514. The cubic root of 130656440 is about 507.4309352981.

The spelling of 130656440 in words is "one hundred thirty million, six hundred fifty-six thousand, four hundred forty".