216890997840 has 200 divisors, whose sum is σ = 821776161888. Its totient is φ = 52579618560.

The previous prime is 216890997821. The next prime is 216890997853. The reversal of 216890997840 is 48799098612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1450122 + ... + 1592681.

Almost surely, 2^216890997840 is an apocalyptic number.

216890997840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216890997840 is an abundant number, since it is smaller than the sum of its proper divisors (604885164048).

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

216890997840 is a wasteful number, since it uses less digits than its factorization.

216890997840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042839 (or 3042824 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 216890997840 in words is "two hundred sixteen billion, eight hundred ninety million, nine hundred ninety-seven thousand, eight hundred forty".