128477790 has 96 divisors (see below), whose sum is σ = 389975040. Its totient is φ = 28734912.

The previous prime is 128477759. The next prime is 128477803. The reversal of 128477790 is 97774821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 47 ways as a sum of consecutive naturals, for example, 27441 + ... + 31779.

It is an arithmetic number, because the mean of its divisors is an integer number (4062240).

Almost surely, 2^128477790 is an apocalyptic number.

128477790 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 128477790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194987520).

128477790 is an abundant number, since it is smaller than the sum of its proper divisors (261497250).

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

128477790 is a wasteful number, since it uses less digits than its factorization.

128477790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406 (or 4403 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 128477790 is about 11334.8043653166. The cubic root of 128477790 is about 504.5947014374.

The spelling of 128477790 in words is "one hundred twenty-eight million, four hundred seventy-seven thousand, seven hundred ninety".