128805701 has 2 divisors, whose sum is σ = 128805702. Its totient is φ = 128805700.

The previous prime is 128805689. The next prime is 128805751. The reversal of 128805701 is 107508821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72165025 + 56640676 = 8495^2 + 7526^2 .

It is a cyclic number.

It is not a de Polignac number, because 128805701 - 2¹⁰ = 128804677 is a prime.

It is a super-2 number, since 2×128805701² = 33181817220202802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128805751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64402850 + 64402851.

It is an arithmetic number, because the mean of its divisors is an integer number (64402851).

Almost surely, 2^128805701 is an apocalyptic number.

It is an amenable number.

128805701 is a deficient number, since it is larger than the sum of its proper divisors (1).

128805701 is an equidigital number, since it uses as much as digits as its factorization.

128805701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 128805701 is about 11349.2599318193. The cubic root of 128805701 is about 505.0236253366.

It can be divided in two parts, 12880 and 5701, that added together give a palindrome (18581).

The spelling of 128805701 in words is "one hundred twenty-eight million, eight hundred five thousand, seven hundred one".