128218780 has 12 divisors (see below), whose sum is σ = 269259480. Its totient is φ = 51287504.

The previous prime is 128218763. The next prime is 128218799. The reversal of 128218780 is 87812821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3205450 + ... + 3205489.

It is an arithmetic number, because the mean of its divisors is an integer number (22438290).

Almost surely, 2^128218780 is an apocalyptic number.

128218780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128218780 is an abundant number, since it is smaller than the sum of its proper divisors (141040700).

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

128218780 is a wasteful number, since it uses less digits than its factorization.

128218780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6410948 (or 6410946 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 128218780 is about 11323.3731723369. The cubic root of 128218780 is about 504.2553872810.

The spelling of 128218780 in words is "one hundred twenty-eight million, two hundred eighteen thousand, seven hundred eighty".