72233451638 has 8 divisors (see below), whose sum is σ = 108417522360. Its totient is φ = 36094277520.

The previous prime is 72233451607. The next prime is 72233451643. The reversal of 72233451638 is 83615433227.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

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, 11220128 + ... + 11226563.

It is an arithmetic number, because the mean of its divisors is an integer number (13552190295).

Almost surely, 2^72233451638 is an apocalyptic number.

72233451638 is a deficient number, since it is larger than the sum of its proper divisors (36184070722).

72233451638 is a wasteful number, since it uses less digits than its factorization.

72233451638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22448302.

The product of its digits is 725760, while the sum is 44.

The spelling of 72233451638 in words is "seventy-two billion, two hundred thirty-three million, four hundred fifty-one thousand, six hundred thirty-eight".