128744730 has 48 divisors (see below), whose sum is σ = 338518440. Its totient is φ = 33944064.

The previous prime is 128744729. The next prime is 128744743. The reversal of 128744730 is 37447821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62110161 + 66634569 = 7881^2 + 8163^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27 + ... + 16046.

Almost surely, 2^128744730 is an apocalyptic number.

128744730 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 128744730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169259220).

128744730 is an abundant number, since it is smaller than the sum of its proper divisors (209773710).

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

128744730 is a wasteful number, since it uses less digits than its factorization.

128744730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16175 (or 16172 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 128744730 is about 11346.5734915877. The cubic root of 128744730 is about 504.9439273755.

The spelling of 128744730 in words is "one hundred twenty-eight million, seven hundred forty-four thousand, seven hundred thirty".