7216664438 has 8 divisors (see below), whose sum is σ = 10826880120. Its totient is φ = 3607704400.

The previous prime is 7216664393. The next prime is 7216664447. The reversal of 7216664438 is 8344666127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7216664438² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7216664392 and 7216664401.

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 3 ways as a sum of consecutive naturals, for example, 299408 + ... + 322611.

It is an arithmetic number, because the mean of its divisors is an integer number (1353360015).

Almost surely, 2^7216664438 is an apocalyptic number.

7216664438 is a deficient number, since it is larger than the sum of its proper divisors (3610215682).

7216664438 is a wasteful number, since it uses less digits than its factorization.

7216664438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627822.

The product of its digits is 1161216, while the sum is 47.

The square root of 7216664438 is about 84950.9531317925. The cubic root of 7216664438 is about 1932.4673748569.

It can be divided in two parts, 72166644 and 38, that multiplied together give a palindrome (2742332472).

The spelling of 7216664438 in words is "seven billion, two hundred sixteen million, six hundred sixty-four thousand, four hundred thirty-eight".