215128664 has 32 divisors (see below), whose sum is σ = 413586000. Its totient is φ = 104873472.

The previous prime is 215128663. The next prime is 215128673. The reversal of 215128664 is 466821512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215128663) 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 7 ways as a sum of consecutive naturals, for example, 49907 + ... + 54045.

Almost surely, 2^215128664 is an apocalyptic number.

It is an amenable number.

215128664 is a deficient number, since it is larger than the sum of its proper divisors (198457336).

215128664 is a wasteful number, since it uses less digits than its factorization.

215128664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307 (or 4303 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 215128664 is about 14667.2650483994. The cubic root of 215128664 is about 599.1921201124.

The spelling of 215128664 in words is "two hundred fifteen million, one hundred twenty-eight thousand, six hundred sixty-four".