128606731 has 8 divisors (see below), whose sum is σ = 146398464. Its totient is φ = 111831720.

The previous prime is 128606713. The next prime is 128606741. The reversal of 128606731 is 137606821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-128606731 is a prime.

It is a super-2 number, since 2×128606731² = 33079382517012722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128606741) 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, 253911 + ... + 254416.

It is an arithmetic number, because the mean of its divisors is an integer number (18299808).

Almost surely, 2^128606731 is an apocalyptic number.

128606731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128606731 is a deficient number, since it is larger than the sum of its proper divisors (17791733).

128606731 is a wasteful number, since it uses less digits than its factorization.

128606731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508361.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 128606731 is about 11340.4907742126. The cubic root of 128606731 is about 504.7634496485.

It can be divided in two parts, 12860 and 6731, that added together give a palindrome (19591).

The spelling of 128606731 in words is "one hundred twenty-eight million, six hundred six thousand, seven hundred thirty-one".