72705357 has 14 divisors (see below), whose sum is σ = 109009262. Its totient is φ = 48469752.

The previous prime is 72705329. The next prime is 72705361. The reversal of 72705357 is 75350727.

It can be written as a sum of positive squares in only one way, i.e., 71419401 + 1285956 = 8451^2 + 1134^2 .

It is not a de Polignac number, because 72705357 - 2⁶ = 72705293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72705377) 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 13 ways as a sum of consecutive naturals, for example, 49138 + ... + 50595.

Almost surely, 2^72705357 is an apocalyptic number.

It is an amenable number.

72705357 is a deficient number, since it is larger than the sum of its proper divisors (36303905).

72705357 is an frugal number, since it uses more digits than its factorization.

72705357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99751 (or 99736 counting only the distinct ones).

The product of its (nonzero) digits is 51450, while the sum is 36.

The square root of 72705357 is about 8526.7436340024. The cubic root of 72705357 is about 417.3708723736.

The spelling of 72705357 in words is "seventy-two million, seven hundred five thousand, three hundred fifty-seven".