128730277 has 8 divisors (see below), whose sum is σ = 139401080. Its totient is φ = 118169280.

The previous prime is 128730253. The next prime is 128730311. The reversal of 128730277 is 772037821.

It can be written as a sum of positive squares in 4 ways, for example, as 5387041 + 123343236 = 2321^2 + 11106^2 .

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 128730277 - 2¹⁵ = 128697509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128730247) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 25002 + ... + 29707.

It is an arithmetic number, because the mean of its divisors is an integer number (17425135).

Almost surely, 2^128730277 is an apocalyptic number.

It is an amenable number.

128730277 is a deficient number, since it is larger than the sum of its proper divisors (10670803).

128730277 is a wasteful number, since it uses less digits than its factorization.

128730277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54903.

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 128730277 is about 11345.9365854036. The cubic root of 128730277 is about 504.9250315142.

The spelling of 128730277 in words is "one hundred twenty-eight million, seven hundred thirty thousand, two hundred seventy-seven".