128772701 has 4 divisors (see below), whose sum is σ = 129420000. Its totient is φ = 128125404.

The previous prime is 128772689. The next prime is 128772719. The reversal of 128772701 is 107277821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128772701 - 2¹⁰ = 128771677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128772781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323351 + ... + 323748.

It is an arithmetic number, because the mean of its divisors is an integer number (32355000).

Almost surely, 2^128772701 is an apocalyptic number.

It is an amenable number.

128772701 is a deficient number, since it is larger than the sum of its proper divisors (647299).

128772701 is an equidigital number, since it uses as much as digits as its factorization.

128772701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647298.

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 128772701 is about 11347.8059993992. The cubic root of 128772701 is about 504.9804926622.

The spelling of 128772701 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, seven hundred one".