129091672 has 8 divisors (see below), whose sum is σ = 242046900. Its totient is φ = 64545832.

The previous prime is 129091661. The next prime is 129091687. The reversal of 129091672 is 276190921.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8068222 + ... + 8068237.

Almost surely, 2^129091672 is an apocalyptic number.

It is an amenable number.

129091672 is a deficient number, since it is larger than the sum of its proper divisors (112955228).

129091672 is a wasteful number, since it uses less digits than its factorization.

129091672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16136465 (or 16136461 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 129091672 is about 11361.8516096629. The cubic root of 129091672 is about 505.3970957678.

The spelling of 129091672 in words is "one hundred twenty-nine million, ninety-one thousand, six hundred seventy-two".