72928591 has 8 divisors (see below), whose sum is σ = 77483520. Its totient is φ = 68509728.

The previous prime is 72928547. The next prime is 72928601. The reversal of 72928591 is 19582927.

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 72928591 - 2¹¹ = 72926543 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 (72928501) 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, 32911 + ... + 35056.

It is an arithmetic number, because the mean of its divisors is an integer number (9685440).

Almost surely, 2^72928591 is an apocalyptic number.

72928591 is a deficient number, since it is larger than the sum of its proper divisors (4554929).

72928591 is a wasteful number, since it uses less digits than its factorization.

72928591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68033.

The product of its digits is 90720, while the sum is 43.

The square root of 72928591 is about 8539.8238272227. The cubic root of 72928591 is about 417.7976000955.

The spelling of 72928591 in words is "seventy-two million, nine hundred twenty-eight thousand, five hundred ninety-one".