128876640 has 48 divisors (see below), whose sum is σ = 405962928. Its totient is φ = 34366976.

The previous prime is 128876617. The next prime is 128876663. The reversal of 128876640 is 46678821.

It is an interprime number because it is at equal distance from previous prime (128876617) and next prime (128876663).

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128876592 and 128876601.

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 7 ways as a sum of consecutive naturals, for example, 133767 + ... + 134726.

It is an arithmetic number, because the mean of its divisors is an integer number (8457561).

Almost surely, 2^128876640 is an apocalyptic number.

128876640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128876640 is an abundant number, since it is smaller than the sum of its proper divisors (277086288).

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

128876640 is a wasteful number, since it uses less digits than its factorization.

128876640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268511 (or 268503 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 128876640 is about 11352.3847714918. The cubic root of 128876640 is about 505.1163212750.

The spelling of 128876640 in words is "one hundred twenty-eight million, eight hundred seventy-six thousand, six hundred forty".