129667725 has 36 divisors (see below), whose sum is σ = 253367712. Its totient is φ = 62868000.

The previous prime is 129667717. The next prime is 129667793. The reversal of 129667725 is 527766921.

It is not a de Polignac number, because 129667725 - 2³ = 129667717 is a prime.

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 35 ways as a sum of consecutive naturals, for example, 23721 + ... + 28670.

It is an arithmetic number, because the mean of its divisors is an integer number (7037992).

Almost surely, 2^129667725 is an apocalyptic number.

129667725 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129667725 is a deficient number, since it is larger than the sum of its proper divisors (123699987).

129667725 is a wasteful number, since it uses less digits than its factorization.

129667725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52418 (or 52410 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 129667725 is about 11387.1737055338. The cubic root of 129667725 is about 506.1477342585.

The spelling of 129667725 in words is "one hundred twenty-nine million, six hundred sixty-seven thousand, seven hundred twenty-five".