129690648 has 24 divisors (see below), whose sum is σ = 351245700. Its totient is φ = 43230192.

The previous prime is 129690647. The next prime is 129690653. The reversal of 129690648 is 846096921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-3 number, since 3×129690648³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129690647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 900558 + ... + 900701.

Almost surely, 2^129690648 is an apocalyptic number.

129690648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129690648 is an abundant number, since it is smaller than the sum of its proper divisors (221555052).

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

129690648 is a wasteful number, since it uses less digits than its factorization.

129690648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801271 (or 1801264 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 129690648 is about 11388.1801882478. The cubic root of 129690648 is about 506.1775585417.

The spelling of 129690648 in words is "one hundred twenty-nine million, six hundred ninety thousand, six hundred forty-eight".