216389067840 has 896 divisors, whose sum is σ = 858301194240. Its totient is φ = 50872320000.

The previous prime is 216389067799. The next prime is 216389067847. The reversal of 216389067840 is 48760983612.

216389067840 is a `hidden beast` number, since 216 + 389 + 0 + 6 + 7 + 8 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (216389067847) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 862107715 + ... + 862107965.

It is an arithmetic number, because the mean of its divisors is an integer number (957925440).

Almost surely, 2^216389067840 is an apocalyptic number.

216389067840 is a gapful number since it is divisible by the number (20) 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 216389067840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (429150597120).

216389067840 is an abundant number, since it is smaller than the sum of its proper divisors (641912126400).

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

216389067840 is a wasteful number, since it uses less digits than its factorization.

216389067840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 216389067840 in words is "two hundred sixteen billion, three hundred eighty-nine million, sixty-seven thousand, eight hundred forty".