72537705 has 12 divisors (see below), whose sum is σ = 125732100. Its totient is φ = 38686752.

The previous prime is 72537697. The next prime is 72537743. The reversal of 72537705 is 50773527.

It can be written as a sum of positive squares in 2 ways, for example, as 30702681 + 41835024 = 5541^2 + 6468^2 .

It is not a de Polignac number, because 72537705 - 2³ = 72537697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72537705.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 805930 + ... + 806019.

It is an arithmetic number, because the mean of its divisors is an integer number (10477675).

Almost surely, 2^72537705 is an apocalyptic number.

It is an amenable number.

72537705 is a deficient number, since it is larger than the sum of its proper divisors (53194395).

72537705 is a wasteful number, since it uses less digits than its factorization.

72537705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611960 (or 1611957 counting only the distinct ones).

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

The square root of 72537705 is about 8516.9070090027. The cubic root of 72537705 is about 417.0498189362.

The spelling of 72537705 in words is "seventy-two million, five hundred thirty-seven thousand, seven hundred five".