215780728027392 has 216 divisors, whose sum is σ = 678796152652800. Its totient is φ = 65379610275840.

The previous prime is 215780728027307. The next prime is 215780728027411. The reversal of 215780728027392 is 293720827087512.

215780728027392 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 80 + 7 + 280 + 273 + 9 + 2 = 666.

It is a super-2 number, since 2×215780728027392² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

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, 196044609 + ... + 197142207.

It is an arithmetic number, because the mean of its divisors is an integer number (3142574780800).

Almost surely, 2^{215780728027392} is an apocalyptic number.

215780728027392 is a gapful number since it is divisible by the number (22) 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 215780728027392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339398076326400).

215780728027392 is an abundant number, since it is smaller than the sum of its proper divisors (463015424625408).

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

215780728027392 is a wasteful number, since it uses less digits than its factorization.

215780728027392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105389 (or 1105372 counting only the distinct ones).

The product of its (nonzero) digits is 47416320, while the sum is 63.

The spelling of 215780728027392 in words is "two hundred fifteen trillion, seven hundred eighty billion, seven hundred twenty-eight million, twenty-seven thousand, three hundred ninety-two".