128664466 has 64 divisors (see below), whose sum is σ = 252806400. Its totient is φ = 47775744.

The previous prime is 128664463. The next prime is 128664467. The reversal of 128664466 is 664466821.

It is a super-2 number, since 2×128664466² = 33109089622130312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128664463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166930 + ... + 167698.

It is an arithmetic number, because the mean of its divisors is an integer number (3950100).

Almost surely, 2^128664466 is an apocalyptic number.

128664466 is a deficient number, since it is larger than the sum of its proper divisors (124141934).

128664466 is a wasteful number, since it uses less digits than its factorization.

128664466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851.

The product of its digits is 331776, while the sum is 43.

The square root of 128664466 is about 11343.0360133432. The cubic root of 128664466 is about 504.8389722842.

The spelling of 128664466 in words is "one hundred twenty-eight million, six hundred sixty-four thousand, four hundred sixty-six".