72661606 has 4 divisors (see below), whose sum is σ = 108992412. Its totient is φ = 36330802.

The previous prime is 72661591. The next prime is 72661607. The reversal of 72661606 is 60616627.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72661607) 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 as a sum of consecutive naturals, namely, 18165400 + ... + 18165403.

It is an arithmetic number, because the mean of its divisors is an integer number (27248103).

Almost surely, 2^72661606 is an apocalyptic number.

72661606 is a deficient number, since it is larger than the sum of its proper divisors (36330806).

72661606 is a wasteful number, since it uses less digits than its factorization.

72661606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36330805.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 72661606 is about 8524.1777316056. The cubic root of 72661606 is about 417.2871368793.

The spelling of 72661606 in words is "seventy-two million, six hundred sixty-one thousand, six hundred six".