128218390776 has 320 divisors, whose sum is σ = 423173203200. Its totient is φ = 35514173952.

The previous prime is 128218390771. The next prime is 128218390793. The reversal of 128218390776 is 677093812821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128218390771) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 19533271 + ... + 19539833.

It is an arithmetic number, because the mean of its divisors is an integer number (1322416260).

Almost surely, 2^128218390776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128218390776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211586601600).

128218390776 is an abundant number, since it is smaller than the sum of its proper divisors (294954812424).

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

128218390776 is a wasteful number, since it uses less digits than its factorization.

128218390776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6720 (or 6707 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 128218390776 in words is "one hundred twenty-eight billion, two hundred eighteen million, three hundred ninety thousand, seven hundred seventy-six".