128773800 has 120 divisors (see below), whose sum is σ = 447306750. Its totient is φ = 34335360.

The previous prime is 128773787. The next prime is 128773817. The reversal of 128773800 is 8377821.

It can be written as a sum of positive squares in 3 ways, for example, as 94128804 + 34644996 = 9702^2 + 5886^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 12226 + ... + 20174.

Almost surely, 2^128773800 is an apocalyptic number.

128773800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128773800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223653375).

128773800 is an abundant number, since it is smaller than the sum of its proper divisors (318532950).

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

128773800 is a wasteful number, since it uses less digits than its factorization.

128773800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7977 (or 7959 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 128773800 is about 11347.8544227532. The cubic root of 128773800 is about 504.9819292295.

The spelling of 128773800 in words is "one hundred twenty-eight million, seven hundred seventy-three thousand, eight hundred".