100129428 has 72 divisors (see below), whose sum is σ = 293279168. Its totient is φ = 28211328.

The previous prime is 100129409. The next prime is 100129441. The reversal of 100129428 is 824921001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15675 + ... + 21117.

Almost surely, 2^100129428 is an apocalyptic number.

100129428 is a gapful number since it is divisible by the number (18) 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 100129428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146639584).

100129428 is an abundant number, since it is smaller than the sum of its proper divisors (193149740).

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

100129428 is a wasteful number, since it uses less digits than its factorization.

100129428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5533 (or 5528 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 100129428 is about 10006.4693074031. The cubic root of 100129428 is about 464.3590475498.

The spelling of 100129428 in words is "one hundred million, one hundred twenty-nine thousand, four hundred twenty-eight".