72726641 has 4 divisors (see below), whose sum is σ = 78321012. Its totient is φ = 67132272.

The previous prime is 72726613. The next prime is 72726679. The reversal of 72726641 is 14662727.

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 23726641 + 49000000 = 4871^2 + 7000^2 .

It is a cyclic number.

It is not a de Polignac number, because 72726641 - 2¹⁰ = 72725617 is a prime.

It is a super-2 number, since 2×72726641² = 10578328622285762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72726611) 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, 2797166 + ... + 2797191.

It is an arithmetic number, because the mean of its divisors is an integer number (19580253).

Almost surely, 2^72726641 is an apocalyptic number.

It is an amenable number.

72726641 is a deficient number, since it is larger than the sum of its proper divisors (5594371).

72726641 is a wasteful number, since it uses less digits than its factorization.

72726641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5594370.

The product of its digits is 28224, while the sum is 35.

The square root of 72726641 is about 8527.9916158495. The cubic root of 72726641 is about 417.4115958972.

The spelling of 72726641 in words is "seventy-two million, seven hundred twenty-six thousand, six hundred forty-one".