128772700 has 72 divisors (see below), whose sum is σ = 323979264. Its totient is φ = 43512000.

The previous prime is 128772689. The next prime is 128772719. The reversal of 128772700 is 7277821.

It is a congruent number.

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, 48405 + ... + 50995.

It is an arithmetic number, because the mean of its divisors is an integer number (4499712).

Almost surely, 2^128772700 is an apocalyptic number.

128772700 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 128772700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161989632).

128772700 is an abundant number, since it is smaller than the sum of its proper divisors (195206564).

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

128772700 is a wasteful number, since it uses less digits than its factorization.

128772700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2683 (or 2676 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 128772700 is about 11347.8059553378. The cubic root of 128772700 is about 504.9804913550.

The spelling of 128772700 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, seven hundred".