128712601 has 8 divisors (see below), whose sum is σ = 130402440. Its totient is φ = 127028352.

The previous prime is 128712587. The next prime is 128712613. The reversal of 128712601 is 106217821.

It can be written as a sum of positive squares in 4 ways, for example, as 18966025 + 109746576 = 4355^2 + 10476^2 .

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 128712601 - 2²⁵ = 95158169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128712601.

It is not an unprimeable number, because it can be changed into a prime (128712691) 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, 64251 + ... + 66223.

It is an arithmetic number, because the mean of its divisors is an integer number (16300305).

Almost surely, 2^128712601 is an apocalyptic number.

It is an amenable number.

128712601 is a deficient number, since it is larger than the sum of its proper divisors (1689839).

128712601 is an equidigital number, since it uses as much as digits as its factorization.

128712601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 128712601 is about 11345.1576013734. The cubic root of 128712601 is about 504.9019199779.

The spelling of 128712601 in words is "one hundred twenty-eight million, seven hundred twelve thousand, six hundred one".