128777019840 has 336 divisors, whose sum is σ = 507889654272. Its totient is φ = 29337458688.

The previous prime is 128777019817. The next prime is 128777019883. The reversal of 128777019840 is 48910777821.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6178717 + ... + 6199523.

It is an arithmetic number, because the mean of its divisors is an integer number (1511576352).

Almost surely, 2^128777019840 is an apocalyptic number.

128777019840 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 128777019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253944827136).

128777019840 is an abundant number, since it is smaller than the sum of its proper divisors (379112634432).

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

128777019840 is a wasteful number, since it uses less digits than its factorization.

128777019840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21144 (or 21131 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 128777019840 in words is "one hundred twenty-eight billion, seven hundred seventy-seven million, nineteen thousand, eight hundred forty".