128508500 has 24 divisors (see below), whose sum is σ = 280663656. Its totient is φ = 51403200.

The previous prime is 128508487. The next prime is 128508539. The reversal of 128508500 is 5805821.

It can be written as a sum of positive squares in 4 ways, for example, as 33016516 + 95491984 = 5746^2 + 9772^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128009 + ... + 129008.

It is an arithmetic number, because the mean of its divisors is an integer number (11694319).

Almost surely, 2^128508500 is an apocalyptic number.

128508500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128508500 is an abundant number, since it is smaller than the sum of its proper divisors (152155156).

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

128508500 is a wasteful number, since it uses less digits than its factorization.

128508500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257036 (or 257024 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 128508500 is about 11336.1589614825. The cubic root of 128508500 is about 504.6349025979.

The spelling of 128508500 in words is "one hundred twenty-eight million, five hundred eight thousand, five hundred".