128307780 has 48 divisors (see below), whose sum is σ = 399181440. Its totient is φ = 34215264.

The previous prime is 128307757. The next prime is 128307811. The reversal of 128307780 is 87703821.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118264 + ... + 119343.

It is an arithmetic number, because the mean of its divisors is an integer number (8316280).

Almost surely, 2^128307780 is an apocalyptic number.

128307780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128307780 is an abundant number, since it is smaller than the sum of its proper divisors (270873660).

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

128307780 is a wasteful number, since it uses less digits than its factorization.

128307780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237625 (or 237617 counting only the distinct ones).

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

The square root of 128307780 is about 11327.3024149618. The cubic root of 128307780 is about 504.3720325692.

The spelling of 128307780 in words is "one hundred twenty-eight million, three hundred seven thousand, seven hundred eighty".