128760261 has 32 divisors (see below), whose sum is σ = 214928640. Its totient is φ = 66855936.

The previous prime is 128760257. The next prime is 128760271. The reversal of 128760261 is 162067821.

It is not a de Polignac number, because 128760261 - 2² = 128760257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128760251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4135 + ... + 16571.

It is an arithmetic number, because the mean of its divisors is an integer number (6716520).

Almost surely, 2^128760261 is an apocalyptic number.

It is an amenable number.

128760261 is a deficient number, since it is larger than the sum of its proper divisors (86168379).

128760261 is a wasteful number, since it uses less digits than its factorization.

128760261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12493.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 128760261 is about 11347.2578625851. The cubic root of 128760261 is about 504.9642310384.

The spelling of 128760261 in words is "one hundred twenty-eight million, seven hundred sixty thousand, two hundred sixty-one".