72651705 has 16 divisors (see below), whose sum is σ = 132849024. Its totient is φ = 33212160.

The previous prime is 72651703. The next prime is 72651721. The reversal of 72651705 is 50715627.

It is not a de Polignac number, because 72651705 - 2¹ = 72651703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72651701) 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 in 15 ways as a sum of consecutive naturals, for example, 345856 + ... + 346065.

It is an arithmetic number, because the mean of its divisors is an integer number (8303064).

Almost surely, 2^72651705 is an apocalyptic number.

It is an amenable number.

72651705 is a deficient number, since it is larger than the sum of its proper divisors (60197319).

72651705 is a wasteful number, since it uses less digits than its factorization.

72651705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691936.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 72651705 is about 8523.5969519916. The cubic root of 72651705 is about 417.2681825885.

The spelling of 72651705 in words is "seventy-two million, six hundred fifty-one thousand, seven hundred five".