272644661 has 4 divisors (see below), whose sum is σ = 286994400. Its totient is φ = 258294924.

The previous prime is 272644649. The next prime is 272644679. The reversal of 272644661 is 166446272.

272644661 = 2159² + 2160² + ... + 2215².

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-272644661 is a prime.

It is a super-2 number, since 2×272644661² = 148670222343609842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (272640661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7174841 + ... + 7174878.

It is an arithmetic number, because the mean of its divisors is an integer number (71748600).

Almost surely, 2^272644661 is an apocalyptic number.

It is an amenable number.

272644661 is a deficient number, since it is larger than the sum of its proper divisors (14349739).

272644661 is a wasteful number, since it uses less digits than its factorization.

272644661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14349738.

The product of its digits is 96768, while the sum is 38.

The square root of 272644661 is about 16511.9550932044. The cubic root of 272644661 is about 648.4338317315.

The spelling of 272644661 in words is "two hundred seventy-two million, six hundred forty-four thousand, six hundred sixty-one".