129128496 has 80 divisors (see below), whose sum is σ = 383142144. Its totient is φ = 36709632.

The previous prime is 129128491. The next prime is 129128507. The reversal of 129128496 is 694821921.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (129128491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75426 + ... + 77118.

Almost surely, 2^129128496 is an apocalyptic number.

129128496 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129128496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191571072).

129128496 is an abundant number, since it is smaller than the sum of its proper divisors (254013648).

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

129128496 is a wasteful number, since it uses less digits than its factorization.

129128496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938 (or 1932 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 129128496 is about 11363.4720046296. The cubic root of 129128496 is about 505.4451468234.

The spelling of 129128496 in words is "one hundred twenty-nine million, one hundred twenty-eight thousand, four hundred ninety-six".