72705163 has 2 divisors, whose sum is σ = 72705164. Its totient is φ = 72705162.

The previous prime is 72705151. The next prime is 72705167. The reversal of 72705163 is 36150727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72705163 - 2⁹ = 72704651 is a prime.

It is not a weakly prime, because it can be changed into another prime (72705167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36352581 + 36352582.

It is an arithmetic number, because the mean of its divisors is an integer number (36352582).

Almost surely, 2^72705163 is an apocalyptic number.

72705163 is a deficient number, since it is larger than the sum of its proper divisors (1).

72705163 is an equidigital number, since it uses as much as digits as its factorization.

72705163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 72705163 is about 8526.7322580224. The cubic root of 72705163 is about 417.3705011492.

The spelling of 72705163 in words is "seventy-two million, seven hundred five thousand, one hundred sixty-three".