128773705 has 8 divisors (see below), whose sum is σ = 155131272. Its totient is φ = 102617088.

The previous prime is 128773703. The next prime is 128773739. The reversal of 128773705 is 507377821.

It can be written as a sum of positive squares in 4 ways, for example, as 16752649 + 112021056 = 4093^2 + 10584^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128773705 - 2¹ = 128773703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128773703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48822 + ... + 51391.

It is an arithmetic number, because the mean of its divisors is an integer number (19391409).

Almost surely, 2^128773705 is an apocalyptic number.

It is an amenable number.

128773705 is a deficient number, since it is larger than the sum of its proper divisors (26357567).

128773705 is a wasteful number, since it uses less digits than its factorization.

128773705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100475.

The product of its (nonzero) digits is 82320, while the sum is 40.

The square root of 128773705 is about 11347.8502369392. The cubic root of 128773705 is about 504.9818050498.

The spelling of 128773705 in words is "one hundred twenty-eight million, seven hundred seventy-three thousand, seven hundred five".