128662697 has 2 divisors, whose sum is σ = 128662698. Its totient is φ = 128662696.

The previous prime is 128662693. The next prime is 128662777. The reversal of 128662697 is 796266821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124902976 + 3759721 = 11176^2 + 1939^2 .

It is a cyclic number.

It is not a de Polignac number, because 128662697 - 2² = 128662693 is a prime.

It is not a weakly prime, because it can be changed into another prime (128662693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64331348 + 64331349.

It is an arithmetic number, because the mean of its divisors is an integer number (64331349).

Almost surely, 2^128662697 is an apocalyptic number.

It is an amenable number.

128662697 is a deficient number, since it is larger than the sum of its proper divisors (1).

128662697 is an equidigital number, since it uses as much as digits as its factorization.

128662697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 128662697 is about 11342.9580357154. The cubic root of 128662697 is about 504.8366586067.

The spelling of 128662697 in words is "one hundred twenty-eight million, six hundred sixty-two thousand, six hundred ninety-seven".