128990070 has 160 divisors (see below), whose sum is σ = 391412736. Its totient is φ = 30196800.

The previous prime is 128990063. The next prime is 128990123. The reversal of 128990070 is 70099821.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 275977 + ... + 276443.

Almost surely, 2^128990070 is an apocalyptic number.

128990070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128990070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195706368).

128990070 is an abundant number, since it is smaller than the sum of its proper divisors (262422666).

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

128990070 is a wasteful number, since it uses less digits than its factorization.

128990070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 128990070 is about 11357.3795393128. The cubic root of 128990070 is about 505.2644695176.

The spelling of 128990070 in words is "one hundred twenty-eight million, nine hundred ninety thousand, seventy".