72633551 has 2 divisors, whose sum is σ = 72633552. Its totient is φ = 72633550.

The previous prime is 72633541. The next prime is 72633557. The reversal of 72633551 is 15533627.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72633551 - 2¹⁸ = 72371407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72633557) 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, 36316775 + 36316776.

It is an arithmetic number, because the mean of its divisors is an integer number (36316776).

Almost surely, 2^72633551 is an apocalyptic number.

72633551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72633551 is an equidigital number, since it uses as much as digits as its factorization.

72633551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 32.

The square root of 72633551 is about 8522.5319594590. The cubic root of 72633551 is about 417.2334244338.

The spelling of 72633551 in words is "seventy-two million, six hundred thirty-three thousand, five hundred fifty-one".