72328549 has 4 divisors (see below), whose sum is σ = 74661760. Its totient is φ = 69995340.

The previous prime is 72328541. The next prime is 72328561. The reversal of 72328549 is 94582327.

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 72328549 - 2³ = 72328541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72328541) 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, 1166559 + ... + 1166620.

It is an arithmetic number, because the mean of its divisors is an integer number (18665440).

Almost surely, 2^72328549 is an apocalyptic number.

It is an amenable number.

72328549 is a deficient number, since it is larger than the sum of its proper divisors (2333211).

72328549 is a wasteful number, since it uses less digits than its factorization.

72328549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333210.

The product of its digits is 120960, while the sum is 40.

The square root of 72328549 is about 8504.6192742533. The cubic root of 72328549 is about 416.6485910736.

The spelling of 72328549 in words is "seventy-two million, three hundred twenty-eight thousand, five hundred forty-nine".