128820177400 has 24 divisors (see below), whose sum is σ = 299506912920. Its totient is φ = 51528070880.

The previous prime is 128820177391. The next prime is 128820177439. The reversal of 128820177400 is 4771028821.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 322050244 + ... + 322050643.

It is an arithmetic number, because the mean of its divisors is an integer number (12479454705).

Almost surely, 2^128820177400 is an apocalyptic number.

128820177400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128820177400 is an abundant number, since it is smaller than the sum of its proper divisors (170686735520).

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

128820177400 is a wasteful number, since it uses less digits than its factorization.

128820177400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644100903 (or 644100894 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The spelling of 128820177400 in words is "one hundred twenty-eight billion, eight hundred twenty million, one hundred seventy-seven thousand, four hundred".