216407381976 has 48 divisors (see below), whose sum is σ = 589836499200. Its totient is φ = 71676326592.

The previous prime is 216407381969. The next prime is 216407381987. The reversal of 216407381976 is 679183704612.

216407381976 is a `hidden beast` number, since 2 + 16 + 407 + 38 + 197 + 6 = 666.

216407381976 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9560856 + ... + 9583463.

It is an arithmetic number, because the mean of its divisors is an integer number (12288260400).

Almost surely, 2^216407381976 is an apocalyptic number.

It is an amenable number.

216407381976 is an abundant number, since it is smaller than the sum of its proper divisors (373429117224).

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

216407381976 is a wasteful number, since it uses less digits than its factorization.

216407381976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19144488 (or 19144481 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 216407381976 in words is "two hundred sixteen billion, four hundred seven million, three hundred eighty-one thousand, nine hundred seventy-six".