72750221 has 16 divisors (see below), whose sum is σ = 78336000. Its totient is φ = 67359600.

The previous prime is 72750203. The next prime is 72750269. The reversal of 72750221 is 12205727.

It is a cyclic number.

It is not a de Polignac number, because 72750221 - 2¹⁸ = 72488077 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 (72752221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268316 + ... + 268586.

It is an arithmetic number, because the mean of its divisors is an integer number (4896000).

Almost surely, 2^72750221 is an apocalyptic number.

72750221 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

72750221 is a deficient number, since it is larger than the sum of its proper divisors (5585779).

72750221 is a wasteful number, since it uses less digits than its factorization.

72750221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 72750221 is about 8529.3740098556. The cubic root of 72750221 is about 417.4567031726.

Adding to 72750221 its reverse (12205727), we get a palindrome (84955948).

The spelling of 72750221 in words is "seventy-two million, seven hundred fifty thousand, two hundred twenty-one".