72660061 has 4 divisors (see below), whose sum is σ = 73036732. Its totient is φ = 72283392.

The previous prime is 72660043. The next prime is 72660113. The reversal of 72660061 is 16006627.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21808900 + 50851161 = 4670^2 + 7131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72660061 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 (72660031) 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 3 ways as a sum of consecutive naturals, for example, 188046 + ... + 188431.

It is an arithmetic number, because the mean of its divisors is an integer number (18259183).

Almost surely, 2^72660061 is an apocalyptic number.

It is an amenable number.

72660061 is a deficient number, since it is larger than the sum of its proper divisors (376671).

72660061 is a wasteful number, since it uses less digits than its factorization.

72660061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376670.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 72660061 is about 8524.0871065470. The cubic root of 72660061 is about 417.2841792733.

Adding to 72660061 its reverse (16006627), we get a palindrome (88666688).

The spelling of 72660061 in words is "seventy-two million, six hundred sixty thousand, sixty-one".