130505780 has 24 divisors (see below), whose sum is σ = 275063208. Its totient is φ = 52011648.

The previous prime is 130505743. The next prime is 130505801. The reversal of 130505780 is 87505031.

It can be written as a sum of positive squares in 4 ways, for example, as 6584356 + 123921424 = 2566^2 + 11132^2 .

It is a super-2 number, since 2×130505780² = 34063517226816800, which contains 22 as substring.

It is a congruent number.

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, 6239 + ... + 17318.

It is an arithmetic number, because the mean of its divisors is an integer number (11460967).

Almost surely, 2^130505780 is an apocalyptic number.

130505780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

130505780 is an abundant number, since it is smaller than the sum of its proper divisors (144557428).

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

130505780 is a wasteful number, since it uses less digits than its factorization.

130505780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23843 (or 23841 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 130505780 is about 11423.9126397220. The cubic root of 130505780 is about 507.2358206697.

The spelling of 130505780 in words is "one hundred thirty million, five hundred five thousand, seven hundred eighty".