216626587728 has 40 divisors (see below), whose sum is σ = 562062463200. Its totient is φ = 71893536384.

The previous prime is 216626587673. The next prime is 216626587747. The reversal of 216626587728 is 827785626612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9842838 + ... + 9864821.

It is an arithmetic number, because the mean of its divisors is an integer number (14051561580).

Almost surely, 2^216626587728 is an apocalyptic number.

It is an amenable number.

216626587728 is an abundant number, since it is smaller than the sum of its proper divisors (345435875472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216626587728 is a wasteful number, since it uses less digits than its factorization.

216626587728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19707899 (or 19707893 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 60.

The spelling of 216626587728 in words is "two hundred sixteen billion, six hundred twenty-six million, five hundred eighty-seven thousand, seven hundred twenty-eight".