72328693 has 4 divisors (see below), whose sum is σ = 76583340. Its totient is φ = 68074048.

The previous prime is 72328691. The next prime is 72328703. The reversal of 72328693 is 39682327.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42484324 + 29844369 = 6518^2 + 5463^2 .

It is a cyclic number.

It is not a de Polignac number, because 72328693 - 2¹ = 72328691 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72328691) 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, 2127298 + ... + 2127331.

It is an arithmetic number, because the mean of its divisors is an integer number (19145835).

Almost surely, 2^72328693 is an apocalyptic number.

It is an amenable number.

72328693 is a deficient number, since it is larger than the sum of its proper divisors (4254647).

72328693 is a wasteful number, since it uses less digits than its factorization.

72328693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254646.

The product of its digits is 108864, while the sum is 40.

The square root of 72328693 is about 8504.6277402365. The cubic root of 72328693 is about 416.6488675775.

The spelling of 72328693 in words is "seventy-two million, three hundred twenty-eight thousand, six hundred ninety-three".