128645600 has 36 divisors (see below), whose sum is σ = 314058024. Its totient is φ = 51457920.

The previous prime is 128645581. The next prime is 128645609. The reversal of 128645600 is 6546821.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128645609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79604 + ... + 81203.

It is an arithmetic number, because the mean of its divisors is an integer number (8723834).

Almost surely, 2^128645600 is an apocalyptic number.

128645600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128645600 is an abundant number, since it is smaller than the sum of its proper divisors (185412424).

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

128645600 is a wasteful number, since it uses less digits than its factorization.

128645600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160827 (or 160814 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 128645600 is about 11342.2043712852. The cubic root of 128645600 is about 504.8142963243.

The spelling of 128645600 in words is "one hundred twenty-eight million, six hundred forty-five thousand, six hundred".