72955661 has 4 divisors (see below), whose sum is σ = 72974400. Its totient is φ = 72936924.

The previous prime is 72955643. The next prime is 72955667. The reversal of 72955661 is 16655927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72955661 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 (72955667) 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, 1091 + ... + 12128.

It is an arithmetic number, because the mean of its divisors is an integer number (18243600).

Almost surely, 2^72955661 is an apocalyptic number.

It is an amenable number.

72955661 is a deficient number, since it is larger than the sum of its proper divisors (18739).

72955661 is a wasteful number, since it uses less digits than its factorization.

72955661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18738.

The product of its digits is 113400, while the sum is 41.

The square root of 72955661 is about 8541.4086074839. The cubic root of 72955661 is about 417.8492871035.

The spelling of 72955661 in words is "seventy-two million, nine hundred fifty-five thousand, six hundred sixty-one".