72420449 has 4 divisors (see below), whose sum is σ = 72689940. Its totient is φ = 72150960.

The previous prime is 72420443. The next prime is 72420451. The reversal of 72420449 is 94402427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94402427 = 7 ⋅13486061.

It can be written as a sum of positive squares in 2 ways, for example, as 32982049 + 39438400 = 5743^2 + 6280^2 .

It is a cyclic number.

It is not a de Polignac number, because 72420449 - 2⁸ = 72420193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72420443) 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, 134342 + ... + 134879.

It is an arithmetic number, because the mean of its divisors is an integer number (18172485).

Almost surely, 2^72420449 is an apocalyptic number.

It is an amenable number.

72420449 is a deficient number, since it is larger than the sum of its proper divisors (269491).

72420449 is a wasteful number, since it uses less digits than its factorization.

72420449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269490.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 72420449 is about 8510.0205052632. The cubic root of 72420449 is about 416.8249796989.

The spelling of 72420449 in words is "seventy-two million, four hundred twenty thousand, four hundred forty-nine".