72773551 has 2 divisors, whose sum is σ = 72773552. Its totient is φ = 72773550.

The previous prime is 72773543. The next prime is 72773567. The reversal of 72773551 is 15537727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72773551 - 2³ = 72773543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72773551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72773581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36386775 + 36386776.

It is an arithmetic number, because the mean of its divisors is an integer number (36386776).

Almost surely, 2^72773551 is an apocalyptic number.

72773551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72773551 is an equidigital number, since it uses as much as digits as its factorization.

72773551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51450, while the sum is 37.

The square root of 72773551 is about 8530.7415269717. The cubic root of 72773551 is about 417.5013226200.

The spelling of 72773551 in words is "seventy-two million, seven hundred seventy-three thousand, five hundred fifty-one".