72661135 has 4 divisors (see below), whose sum is σ = 87193368. Its totient is φ = 58128904.

The previous prime is 72661129. The next prime is 72661151. The reversal of 72661135 is 53116627.

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

It is a cyclic number.

It is not a de Polignac number, because 72661135 - 2⁵ = 72661103 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72661097 and 72661106.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 7266109 + ... + 7266118.

It is an arithmetic number, because the mean of its divisors is an integer number (21798342).

Almost surely, 2^72661135 is an apocalyptic number.

72661135 is a deficient number, since it is larger than the sum of its proper divisors (14532233).

72661135 is a wasteful number, since it uses less digits than its factorization.

72661135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14532232.

The product of its digits is 7560, while the sum is 31.

The square root of 72661135 is about 8524.1501042626. The cubic root of 72661135 is about 417.2862352446.

The spelling of 72661135 in words is "seventy-two million, six hundred sixty-one thousand, one hundred thirty-five".