128780955 has 32 divisors (see below), whose sum is σ = 240998400. Its totient is φ = 65066976.

The previous prime is 128780941. The next prime is 128781017. The reversal of 128780955 is 559087821.

It is a happy number.

It is not a de Polignac number, because 128780955 - 2⁵ = 128780923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 128780955.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22539 + ... + 27668.

It is an arithmetic number, because the mean of its divisors is an integer number (7531200).

Almost surely, 2^128780955 is an apocalyptic number.

128780955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128780955 is a deficient number, since it is larger than the sum of its proper divisors (112217445).

128780955 is a wasteful number, since it uses less digits than its factorization.

128780955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50240 (or 50234 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 128780955 is about 11348.1696762077. The cubic root of 128780955 is about 504.9912817500.

The spelling of 128780955 in words is "one hundred twenty-eight million, seven hundred eighty thousand, nine hundred fifty-five".