128020992 has 80 divisors (see below), whose sum is σ = 372110112. Its totient is φ = 38789120.

The previous prime is 128020969. The next prime is 128021011. The reversal of 128020992 is 299020821.

It is a happy number.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13108 + ... + 20684.

Almost surely, 2^128020992 is an apocalyptic number.

128020992 is a gapful number since it is divisible by the number (12) 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 128020992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186055056).

128020992 is an abundant number, since it is smaller than the sum of its proper divisors (244089120).

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

128020992 is an equidigital number, since it uses as much as digits as its factorization.

128020992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7609 (or 7593 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 128020992 is about 11314.6361850481. The cubic root of 128020992 is about 503.9959687256.

The spelling of 128020992 in words is "one hundred twenty-eight million, twenty thousand, nine hundred ninety-two".