72447457 has 8 divisors (see below), whose sum is σ = 74440800. Its totient is φ = 70479744.

The previous prime is 72447433. The next prime is 72447461. The reversal of 72447457 is 75474427.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72447457 - 2¹¹ = 72445409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72447407) 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 7 ways as a sum of consecutive naturals, for example, 607 + ... + 12052.

It is an arithmetic number, because the mean of its divisors is an integer number (9305100).

Almost surely, 2^72447457 is an apocalyptic number.

It is an amenable number.

72447457 is a deficient number, since it is larger than the sum of its proper divisors (1993343).

72447457 is a wasteful number, since it uses less digits than its factorization.

72447457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12815.

The product of its digits is 219520, while the sum is 40.

The square root of 72447457 is about 8511.6071925342. The cubic root of 72447457 is about 416.8767892364.

The spelling of 72447457 in words is "seventy-two million, four hundred forty-seven thousand, four hundred fifty-seven".