129660552 has 48 divisors (see below), whose sum is σ = 401331840. Its totient is φ = 37045728.

The previous prime is 129660533. The next prime is 129660571. The reversal of 129660552 is 255066921.

129660552 is a `hidden beast` number, since 12 + 96 + 6 + 0 + 552 = 666.

It is an interprime number because it is at equal distance from previous prime (129660533) and next prime (129660571).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128128 + ... + 129135.

It is an arithmetic number, because the mean of its divisors is an integer number (8361080).

Almost surely, 2^129660552 is an apocalyptic number.

129660552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129660552 is an abundant number, since it is smaller than the sum of its proper divisors (271671288).

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

129660552 is a wasteful number, since it uses less digits than its factorization.

129660552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257282 (or 257275 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 129660552 is about 11386.8587415494. The cubic root of 129660552 is about 506.1384010065.

The spelling of 129660552 in words is "one hundred twenty-nine million, six hundred sixty thousand, five hundred fifty-two".