129776832 has 42 divisors (see below), whose sum is σ = 371983508. Its totient is φ = 43258752.

The previous prime is 129776809. The next prime is 129776837. The reversal of 129776832 is 238677921.

It is a super-2 number, since 2×129776832² = 33684052247912448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129776837) 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, 112078 + ... + 113229.

Almost surely, 2^129776832 is an apocalyptic number.

129776832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129776832 is an abundant number, since it is smaller than the sum of its proper divisors (242206676).

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

129776832 is a wasteful number, since it uses less digits than its factorization.

129776832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225325 (or 225312 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 129776832 is about 11391.9634830875. The cubic root of 129776832 is about 506.2896579815.

The spelling of 129776832 in words is "one hundred twenty-nine million, seven hundred seventy-six thousand, eight hundred thirty-two".