129828555 has 32 divisors (see below), whose sum is σ = 231443520. Its totient is φ = 69050880.

The previous prime is 129828553. The next prime is 129828581. The reversal of 129828555 is 555828921.

It is a happy number.

129828555 is a `hidden beast` number, since 1 + 2 + 98 + 2 + 8 + 555 = 666.

It is not a de Polignac number, because 129828555 - 2¹ = 129828553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 129828555.

It is not an unprimeable number, because it can be changed into a prime (129828553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57345 + ... + 59565.

It is an arithmetic number, because the mean of its divisors is an integer number (7232610).

Almost surely, 2^129828555 is an apocalyptic number.

129828555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129828555 is a deficient number, since it is larger than the sum of its proper divisors (101614965).

129828555 is a wasteful number, since it uses less digits than its factorization.

129828555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668 (or 2662 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The square root of 129828555 is about 11394.2334099315. The cubic root of 129828555 is about 506.3569102057.

The spelling of 129828555 in words is "one hundred twenty-nine million, eight hundred twenty-eight thousand, five hundred fifty-five".