72705449 has 2 divisors, whose sum is σ = 72705450. Its totient is φ = 72705448.

The previous prime is 72705403. The next prime is 72705467. The reversal of 72705449 is 94450727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72369049 + 336400 = 8507^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 72705449 - 2²⁴ = 55928233 is a prime.

It is not a weakly prime, because it can be changed into another prime (72705469) 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, 36352724 + 36352725.

It is an arithmetic number, because the mean of its divisors is an integer number (36352725).

Almost surely, 2^72705449 is an apocalyptic number.

It is an amenable number.

72705449 is a deficient number, since it is larger than the sum of its proper divisors (1).

72705449 is an equidigital number, since it uses as much as digits as its factorization.

72705449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 72705449 is about 8526.7490287917. The cubic root of 72705449 is about 417.3710484180.

The spelling of 72705449 in words is "seventy-two million, seven hundred five thousand, four hundred forty-nine".