128649297920 has 768 divisors, whose sum is σ = 405603979200. Its totient is φ = 38503710720.

The previous prime is 128649297919. The next prime is 128649297941. The reversal of 128649297920 is 29792946821.

It is a self number, because there is not a number n which added to its sum of digits gives 128649297920.

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, 6771015671 + ... + 6771015689.

Almost surely, 2^128649297920 is an apocalyptic number.

128649297920 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 128649297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202801989600).

128649297920 is an abundant number, since it is smaller than the sum of its proper divisors (276954681280).

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

128649297920 is a wasteful number, since it uses less digits than its factorization.

128649297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 128649297920 in words is "one hundred twenty-eight billion, six hundred forty-nine million, two hundred ninety-seven thousand, nine hundred twenty".