72447647 has 4 divisors (see below), whose sum is σ = 74132520. Its totient is φ = 70762776.

The previous prime is 72447623. The next prime is 72447653. The reversal of 72447647 is 74674427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72447647 - 2¹⁶ = 72382111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72447547) 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, 842372 + ... + 842457.

It is an arithmetic number, because the mean of its divisors is an integer number (18533130).

Almost surely, 2^72447647 is an apocalyptic number.

72447647 is a deficient number, since it is larger than the sum of its proper divisors (1684873).

72447647 is a wasteful number, since it uses less digits than its factorization.

72447647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684872.

The product of its digits is 263424, while the sum is 41.

The square root of 72447647 is about 8511.6183537562. The cubic root of 72447647 is about 416.8771536684.

The spelling of 72447647 in words is "seventy-two million, four hundred forty-seven thousand, six hundred forty-seven".