128124990 has 160 divisors (see below), whose sum is σ = 401448960. Its totient is φ = 28714176.

The previous prime is 128124979. The next prime is 128125021. The reversal of 128124990 is 99421821.

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 79 ways as a sum of consecutive naturals, for example, 334339 + ... + 334721.

It is an arithmetic number, because the mean of its divisors is an integer number (2509056).

Almost surely, 2^128124990 is an apocalyptic number.

128124990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128124990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200724480).

128124990 is an abundant number, since it is smaller than the sum of its proper divisors (273323970).

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

128124990 is a wasteful number, since it uses less digits than its factorization.

128124990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 128124990 is about 11319.2309809457. The cubic root of 128124990 is about 504.1324056889.

The spelling of 128124990 in words is "one hundred twenty-eight million, one hundred twenty-four thousand, nine hundred ninety".