102128856880 has 40 divisors (see below), whose sum is σ = 245637514800. Its totient is φ = 39442867968.

The previous prime is 102128856877. The next prime is 102128856881. The reversal of 102128856880 is 88658821201.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (102128856881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22008210 + ... + 22012849.

It is an arithmetic number, because the mean of its divisors is an integer number (6140937870).

Almost surely, 2^102128856880 is an apocalyptic number.

102128856880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102128856880 is an abundant number, since it is smaller than the sum of its proper divisors (143508657920).

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

102128856880 is a wasteful number, since it uses less digits than its factorization.

102128856880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44021101 (or 44021095 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 49.

The spelling of 102128856880 in words is "one hundred two billion, one hundred twenty-eight million, eight hundred fifty-six thousand, eight hundred eighty".