72073945639 has 8 divisors (see below), whose sum is σ = 73153964160. Its totient is φ = 71001453816.

The previous prime is 72073945609. The next prime is 72073945667. The reversal of 72073945639 is 93654937027.

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 72073945639 - 2¹³ = 72073937447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72073945639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72073945609) 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 7 ways as a sum of consecutive naturals, for example, 1862379 + ... + 1900684.

It is an arithmetic number, because the mean of its divisors is an integer number (9144245520).

Almost surely, 2^72073945639 is an apocalyptic number.

72073945639 is a deficient number, since it is larger than the sum of its proper divisors (1080018521).

72073945639 is a wasteful number, since it uses less digits than its factorization.

72073945639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3763349.

The product of its (nonzero) digits is 8573040, while the sum is 55.

The spelling of 72073945639 in words is "seventy-two billion, seventy-three million, nine hundred forty-five thousand, six hundred thirty-nine".