128769380 has 24 divisors (see below), whose sum is σ = 270664632. Its totient is φ = 51460352.

The previous prime is 128769379. The next prime is 128769401. The reversal of 128769380 is 83967821.

It can be written as a sum of positive squares in 4 ways, for example, as 74511424 + 54257956 = 8632^2 + 7366^2 .

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, 26414 + ... + 30906.

It is an arithmetic number, because the mean of its divisors is an integer number (11277693).

Almost surely, 2^128769380 is an apocalyptic number.

128769380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128769380 is an abundant number, since it is smaller than the sum of its proper divisors (141895252).

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

128769380 is a wasteful number, since it uses less digits than its factorization.

128769380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5935 (or 5933 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 128769380 is about 11347.6596706105. The cubic root of 128769380 is about 504.9761515386.

The spelling of 128769380 in words is "one hundred twenty-eight million, seven hundred sixty-nine thousand, three hundred eighty".