216909075924 has 72 divisors (see below), whose sum is σ = 572475496320. Its totient is φ = 69118496832.

The previous prime is 216909075923. The next prime is 216909075937. The reversal of 216909075924 is 429570909612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216909075923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1338409 + ... + 1491695.

It is an arithmetic number, because the mean of its divisors is an integer number (7951048560).

Almost surely, 2^216909075924 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216909075924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286237748160).

216909075924 is an abundant number, since it is smaller than the sum of its proper divisors (355566420396).

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

216909075924 is a wasteful number, since it uses less digits than its factorization.

216909075924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155029 (or 155024 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 216909075924 in words is "two hundred sixteen billion, nine hundred nine million, seventy-five thousand, nine hundred twenty-four".