128879250 has 64 divisors (see below), whose sum is σ = 323526528. Its totient is φ = 34171200.

The previous prime is 128879243. The next prime is 128879263. The reversal of 128879250 is 52978821.

It is a super-2 number, since 2×128879250² = 33219722161125000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169872 + ... + 170628.

It is an arithmetic number, because the mean of its divisors is an integer number (5055102).

Almost surely, 2^128879250 is an apocalyptic number.

128879250 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 128879250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161763264).

128879250 is an abundant number, since it is smaller than the sum of its proper divisors (194647278).

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

128879250 is a wasteful number, since it uses less digits than its factorization.

128879250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 128879250 is about 11352.4997247302. The cubic root of 128879250 is about 505.1197311113.

The spelling of 128879250 in words is "one hundred twenty-eight million, eight hundred seventy-nine thousand, two hundred fifty".