128631207 has 8 divisors (see below), whose sum is σ = 171634176. Its totient is φ = 85691192.

The previous prime is 128631193. The next prime is 128631221. The reversal of 128631207 is 702136821.

It is an interprime number because it is at equal distance from previous prime (128631193) and next prime (128631221).

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 128631207 - 2⁶ = 128631143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128633207) 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, 10743 + ... + 19304.

It is an arithmetic number, because the mean of its divisors is an integer number (21454272).

Almost surely, 2^128631207 is an apocalyptic number.

128631207 is a deficient number, since it is larger than the sum of its proper divisors (43002969).

128631207 is a wasteful number, since it uses less digits than its factorization.

128631207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31477.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 128631207 is about 11341.5698648820. The cubic root of 128631207 is about 504.7954692440.

The spelling of 128631207 in words is "one hundred twenty-eight million, six hundred thirty-one thousand, two hundred seven".