128995776 has 336 divisors, whose sum is σ = 479291904. Its totient is φ = 32237568.

The previous prime is 128995759. The next prime is 128995787. The reversal of 128995776 is 677599821.

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

Its product of digits (1905120) is a multiple of the sum of its prime factors (168).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1205515 + ... + 1205621.

It is an arithmetic number, because the mean of its divisors is an integer number (1426464).

Almost surely, 2^128995776 is an apocalyptic number.

128995776 is a gapful number since it is divisible by the number (16) 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 128995776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239645952).

128995776 is an abundant number, since it is smaller than the sum of its proper divisors (350296128).

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

128995776 is a wasteful number, since it uses less digits than its factorization.

128995776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 155 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 128995776 is about 11357.6307388469. The cubic root of 128995776 is about 505.2719196946.

The spelling of 128995776 in words is "one hundred twenty-eight million, nine hundred ninety-five thousand, seven hundred seventy-six".