216458781396 has 96 divisors (see below), whose sum is σ = 595396061568. Its totient is φ = 60341122560.

The previous prime is 216458781353. The next prime is 216458781443. The reversal of 216458781396 is 693187854612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287530 + ... + 718046.

It is an arithmetic number, because the mean of its divisors is an integer number (6202042308).

Almost surely, 2^216458781396 is an apocalyptic number.

216458781396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216458781396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297698030784).

216458781396 is an abundant number, since it is smaller than the sum of its proper divisors (378937280172).

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

216458781396 is a wasteful number, since it uses less digits than its factorization.

216458781396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430841 (or 430839 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 60.

The spelling of 216458781396 in words is "two hundred sixteen billion, four hundred fifty-eight million, seven hundred eighty-one thousand, three hundred ninety-six".