215689151728 has 20 divisors (see below), whose sum is σ = 418478974560. Its totient is φ = 107694577664.

The previous prime is 215689151707. The next prime is 215689151773. The reversal of 215689151728 is 827151986512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9363025 + ... + 9386032.

It is an arithmetic number, because the mean of its divisors is an integer number (20923948728).

Almost surely, 2^215689151728 is an apocalyptic number.

It is an amenable number.

215689151728 is a deficient number, since it is larger than the sum of its proper divisors (202789822832).

215689151728 is a wasteful number, since it uses less digits than its factorization.

215689151728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18749784 (or 18749778 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 55.

The spelling of 215689151728 in words is "two hundred fifteen billion, six hundred eighty-nine million, one hundred fifty-one thousand, seven hundred twenty-eight".