128077830 has 96 divisors (see below), whose sum is σ = 356638464. Its totient is φ = 31776768.

The previous prime is 128077801. The next prime is 128077837. The reversal of 128077830 is 38770821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128077837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 147979 + ... + 148841.

It is an arithmetic number, because the mean of its divisors is an integer number (3714984).

Almost surely, 2^128077830 is an apocalyptic number.

128077830 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 128077830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178319232).

128077830 is an abundant number, since it is smaller than the sum of its proper divisors (228560634).

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

128077830 is a wasteful number, since it uses less digits than its factorization.

128077830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990 (or 987 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 128077830 is about 11317.1476088279. The cubic root of 128077830 is about 504.0705447361.

The spelling of 128077830 in words is "one hundred twenty-eight million, seventy-seven thousand, eight hundred thirty".