128622697 has 12 divisors (see below), whose sum is σ = 158424660. Its totient is φ = 103762176.

The previous prime is 128622643. The next prime is 128622701. The reversal of 128622697 is 796226821.

It can be written as a sum of positive squares in 2 ways, for example, as 66275881 + 62346816 = 8141^2 + 7896^2 .

It is not a de Polignac number, because 128622697 - 2¹⁹ = 128098409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128622797) 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 11 ways as a sum of consecutive naturals, for example, 76372 + ... + 78037.

It is an arithmetic number, because the mean of its divisors is an integer number (13202055).

Almost surely, 2^128622697 is an apocalyptic number.

128622697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128622697 is a deficient number, since it is larger than the sum of its proper divisors (29801963).

128622697 is a wasteful number, since it uses less digits than its factorization.

128622697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154440 (or 154433 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 128622697 is about 11341.1946901550. The cubic root of 128622697 is about 504.7843368905.

The spelling of 128622697 in words is "one hundred twenty-eight million, six hundred twenty-two thousand, six hundred ninety-seven".