72305639 has 8 divisors (see below), whose sum is σ = 82703520. Its totient is φ = 61924896.

The previous prime is 72305633. The next prime is 72305657. The reversal of 72305639 is 93650327.

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 72305639 - 2⁸ = 72305383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72305599 and 72305608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72305633) 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, 6617 + ... + 13725.

It is an arithmetic number, because the mean of its divisors is an integer number (10337940).

Almost surely, 2^72305639 is an apocalyptic number.

72305639 is a deficient number, since it is larger than the sum of its proper divisors (10397881).

72305639 is a wasteful number, since it uses less digits than its factorization.

72305639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8569.

The product of its (nonzero) digits is 34020, while the sum is 35.

The square root of 72305639 is about 8503.2722524920. The cubic root of 72305639 is about 416.6045954114.

The spelling of 72305639 in words is "seventy-two million, three hundred five thousand, six hundred thirty-nine".