216336720791828 has 48 divisors (see below), whose sum is σ = 465962849076480. Its totient is φ = 85582502256384.

The previous prime is 216336720791813. The next prime is 216336720791843. The reversal of 216336720791828 is 828197027633612.

It is an interprime number because it is at equal distance from previous prime (216336720791813) and next prime (216336720791843).

It is a super-2 number, since 2×216336720791828² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20686793 + ... + 29336271.

It is an arithmetic number, because the mean of its divisors is an integer number (9707559355760).

Almost surely, 2^{216336720791828} is an apocalyptic number.

216336720791828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

216336720791828 is an abundant number, since it is smaller than the sum of its proper divisors (249626128284652).

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

216336720791828 is a wasteful number, since it uses less digits than its factorization.

216336720791828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8718216 (or 8718214 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 65.

The spelling of 216336720791828 in words is "two hundred sixteen trillion, three hundred thirty-six billion, seven hundred twenty million, seven hundred ninety-one thousand, eight hundred twenty-eight".