216123444 has 48 divisors (see below), whose sum is σ = 578403840. Its totient is φ = 69716160.

The previous prime is 216123443. The next prime is 216123463. The reversal of 216123444 is 444321612.

It is a happy number.

216123444 is a `hidden beast` number, since 2 + 1 + 612 + 3 + 4 + 44 = 666.

It is a super-2 number, since 2×216123444² = 93418686092842272, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216123443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28929 + ... + 35624.

It is an arithmetic number, because the mean of its divisors is an integer number (12050080).

Almost surely, 2^216123444 is an apocalyptic number.

It is an amenable number.

216123444 is an abundant number, since it is smaller than the sum of its proper divisors (362280396).

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

216123444 is a wasteful number, since it uses less digits than its factorization.

216123444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64597 (or 64589 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 216123444 is about 14701.1375070094. The cubic root of 216123444 is about 600.1142782328.

The spelling of 216123444 in words is "two hundred sixteen million, one hundred twenty-three thousand, four hundred forty-four".