129976560 has 480 divisors, whose sum is σ = 555714432. Its totient is φ = 26542080.

The previous prime is 129976559. The next prime is 129976571. The reversal of 129976560 is 65679921.

It is a happy number.

129976560 is a `hidden beast` number, since 12 + 9 + 9 + 76 + 560 = 666.

It is a super-2 number, since 2×129976560² = 33787812298867200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3170140 + ... + 3170180.

Almost surely, 2^129976560 is an apocalyptic number.

129976560 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 129976560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277857216).

129976560 is an abundant number, since it is smaller than the sum of its proper divisors (425737872).

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

129976560 is a wasteful number, since it uses less digits than its factorization.

129976560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 129976560 is about 11400.7262926535. The cubic root of 129976560 is about 506.5492533410.

The spelling of 129976560 in words is "one hundred twenty-nine million, nine hundred seventy-six thousand, five hundred sixty".