72653621 has 2 divisors, whose sum is σ = 72653622. Its totient is φ = 72653620.

The previous prime is 72653593. The next prime is 72653629. The reversal of 72653621 is 12635627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47803396 + 24850225 = 6914^2 + 4985^2 .

It is a cyclic number.

It is not a de Polignac number, because 72653621 - 2¹⁰ = 72652597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72653629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36326810 + 36326811.

It is an arithmetic number, because the mean of its divisors is an integer number (36326811).

Almost surely, 2^72653621 is an apocalyptic number.

It is an amenable number.

72653621 is a deficient number, since it is larger than the sum of its proper divisors (1).

72653621 is an equidigital number, since it uses as much as digits as its factorization.

72653621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 32.

The square root of 72653621 is about 8523.7093451150. The cubic root of 72653621 is about 417.2718506778.

The spelling of 72653621 in words is "seventy-two million, six hundred fifty-three thousand, six hundred twenty-one".