128306745 has 36 divisors (see below), whose sum is σ = 258712740. Its totient is φ = 58653504.

The previous prime is 128306743. The next prime is 128306747. The reversal of 128306745 is 547603821.

It is an interprime number because it is at equal distance from previous prime (128306743) and next prime (128306747).

It can be written as a sum of positive squares in 2 ways, for example, as 27123264 + 101183481 = 5208^2 + 10059^2 .

It is not a de Polignac number, because 128306745 - 2¹ = 128306743 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128306743) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26890 + ... + 31299.

It is an arithmetic number, because the mean of its divisors is an integer number (7186465).

Almost surely, 2^128306745 is an apocalyptic number.

128306745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128306745 is an abundant number, since it is smaller than the sum of its proper divisors (130405995).

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

128306745 is a wasteful number, since it uses less digits than its factorization.

128306745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58214 (or 58204 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 128306745 is about 11327.2567287936. The cubic root of 128306745 is about 504.3706763862.

The spelling of 128306745 in words is "one hundred twenty-eight million, three hundred six thousand, seven hundred forty-five".