72999393856 has 21 divisors (see below), whose sum is σ = 144862461481. Its totient is φ = 36498616192.

The previous prime is 72999393851. The next prime is 72999393899. The reversal of 72999393856 is 65839399927.

The square root of 72999393856 is 270184.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 43547342400 + 29452051456 = 208680^2 + 171616^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72999393851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2144586 + ... + 2178358.

Almost surely, 2^72999393856 is an apocalyptic number.

72999393856 is the 270184-th square number.

It is an amenable number.

72999393856 is a deficient number, since it is larger than the sum of its proper divisors (71863067625).

72999393856 is an frugal number, since it uses more digits than its factorization.

72999393856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67558 (or 33775 counting only the distinct ones).

The product of its digits is 198404640, while the sum is 70.

The spelling of 72999393856 in words is "seventy-two billion, nine hundred ninety-nine million, three hundred ninety-three thousand, eight hundred fifty-six".