72999393857 has 8 divisors (see below), whose sum is σ = 78621072936. Its totient is φ = 67378620672.

The previous prime is 72999393851. The next prime is 72999393899. The reversal of 72999393857 is 75839399927.

It is a Cunningham number, because it is equal to 270184²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 72999393856 = 1^2 + 270184^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 72999393857 - 2¹⁶ = 72999328321 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54248 + ... + 385929.

It is an arithmetic number, because the mean of its divisors is an integer number (9827634117).

Almost surely, 2^72999393857 is an apocalyptic number.

It is an amenable number.

72999393857 is a deficient number, since it is larger than the sum of its proper divisors (5621679079).

72999393857 is a wasteful number, since it uses less digits than its factorization.

72999393857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452947.

The product of its digits is 231472080, while the sum is 71.

The spelling of 72999393857 in words is "seventy-two billion, nine hundred ninety-nine million, three hundred ninety-three thousand, eight hundred fifty-seven".