72320393 has 4 divisors (see below), whose sum is σ = 72799488. Its totient is φ = 71841300.

The previous prime is 72320383. The next prime is 72320399. The reversal of 72320393 is 39302327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72320393 - 2¹² = 72316297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72320399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239321 + ... + 239622.

It is an arithmetic number, because the mean of its divisors is an integer number (18199872).

Almost surely, 2^72320393 is an apocalyptic number.

It is an amenable number.

72320393 is a deficient number, since it is larger than the sum of its proper divisors (479095).

72320393 is a wasteful number, since it uses less digits than its factorization.

72320393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479094.

The product of its (nonzero) digits is 6804, while the sum is 29.

The square root of 72320393 is about 8504.1397566127. The cubic root of 72320393 is about 416.6329296062.

The spelling of 72320393 in words is "seventy-two million, three hundred twenty thousand, three hundred ninety-three".