72234649 has 4 divisors (see below), whose sum is σ = 76483764. Its totient is φ = 67985536.

The previous prime is 72234647. The next prime is 72234691. The reversal of 72234649 is 94643227.

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 37601424 + 34633225 = 6132^2 + 5885^2 .

It is a cyclic number.

It is not a de Polignac number, because 72234649 - 2¹ = 72234647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72234641) 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, 2124532 + ... + 2124565.

It is an arithmetic number, because the mean of its divisors is an integer number (19120941).

Almost surely, 2^72234649 is an apocalyptic number.

It is an amenable number.

72234649 is a deficient number, since it is larger than the sum of its proper divisors (4249115).

72234649 is a wasteful number, since it uses less digits than its factorization.

72234649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249114.

The product of its digits is 72576, while the sum is 37.

The square root of 72234649 is about 8499.0969520297. The cubic root of 72234649 is about 416.4682093480.

The spelling of 72234649 in words is "seventy-two million, two hundred thirty-four thousand, six hundred forty-nine".