128864850 has 48 divisors (see below), whose sum is σ = 325023840. Its totient is φ = 33779200.

The previous prime is 128864849. The next prime is 128864863. The reversal of 128864850 is 58468821.

It is a super-2 number, since 2×128864850² = 33212299131045000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1570 + ... + 16130.

It is an arithmetic number, because the mean of its divisors is an integer number (6771330).

Almost surely, 2^128864850 is an apocalyptic number.

128864850 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 128864850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162511920).

128864850 is an abundant number, since it is smaller than the sum of its proper divisors (196158990).

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

128864850 is a wasteful number, since it uses less digits than its factorization.

128864850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14635 (or 14630 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 128864850 is about 11351.8654854610. The cubic root of 128864850 is about 505.1009176481.

The spelling of 128864850 in words is "one hundred twenty-eight million, eight hundred sixty-four thousand, eight hundred fifty".