216431622 has 128 divisors (see below), whose sum is σ = 560332800. Its totient is φ = 61236000.

The previous prime is 216431609. The next prime is 216431627. The reversal of 216431622 is 226134612.

216431622 is a `hidden beast` number, since 2 + 1 + 6 + 4 + 31 + 622 = 666.

216431622 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216431627) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1433247 + ... + 1433397.

It is an arithmetic number, because the mean of its divisors is an integer number (4377600).

Almost surely, 2^216431622 is an apocalyptic number.

216431622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 216431622, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280166400).

216431622 is an abundant number, since it is smaller than the sum of its proper divisors (343901178).

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

216431622 is a wasteful number, since it uses less digits than its factorization.

216431622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 313 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 216431622 is about 14711.6152070396. The cubic root of 216431622 is about 600.3993840949.

The spelling of 216431622 in words is "two hundred sixteen million, four hundred thirty-one thousand, six hundred twenty-two".