216073644 has 12 divisors (see below), whose sum is σ = 504171864. Its totient is φ = 72024544.

The previous prime is 216073639. The next prime is 216073657. The reversal of 216073644 is 446370612.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9003057 + ... + 9003080.

It is an arithmetic number, because the mean of its divisors is an integer number (42014322).

Almost surely, 2^216073644 is an apocalyptic number.

It is an amenable number.

216073644 is an abundant number, since it is smaller than the sum of its proper divisors (288098220).

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

216073644 is a wasteful number, since it uses less digits than its factorization.

216073644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18006144 (or 18006142 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 216073644 is about 14699.4436629418. The cubic root of 216073644 is about 600.0681811408.

The spelling of 216073644 in words is "two hundred sixteen million, seventy-three thousand, six hundred forty-four".