128132665 has 16 divisors (see below), whose sum is σ = 158304960. Its totient is φ = 99489600.

The previous prime is 128132663. The next prime is 128132671. The reversal of 128132665 is 566231821.

It is not a de Polignac number, because 128132665 - 2¹ = 128132663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128132665.

It is not an unprimeable number, because it can be changed into a prime (128132663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121390 + ... + 122440.

It is an arithmetic number, because the mean of its divisors is an integer number (9894060).

Almost surely, 2^128132665 is an apocalyptic number.

It is an amenable number.

128132665 is a deficient number, since it is larger than the sum of its proper divisors (30172295).

128132665 is a wasteful number, since it uses less digits than its factorization.

128132665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752.

The product of its digits is 17280, while the sum is 34.

The square root of 128132665 is about 11319.5700006670. The cubic root of 128132665 is about 504.1424717422.

The spelling of 128132665 in words is "one hundred twenty-eight million, one hundred thirty-two thousand, six hundred sixty-five".