72238947 has 32 divisors (see below), whose sum is σ = 108366336. Its totient is φ = 42432000.

The previous prime is 72238939. The next prime is 72238961. The reversal of 72238947 is 74983227.

It is not a de Polignac number, because 72238947 - 2³ = 72238939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72238899 and 72238908.

It is not an unprimeable number, because it can be changed into a prime (72230947) 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 31 ways as a sum of consecutive naturals, for example, 179947 + ... + 180347.

It is an arithmetic number, because the mean of its divisors is an integer number (3386448).

Almost surely, 2^72238947 is an apocalyptic number.

72238947 is a deficient number, since it is larger than the sum of its proper divisors (36127389).

72238947 is a wasteful number, since it uses less digits than its factorization.

72238947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571.

The product of its digits is 169344, while the sum is 42.

The square root of 72238947 is about 8499.3497986611. The cubic root of 72238947 is about 416.4764692108.

The spelling of 72238947 in words is "seventy-two million, two hundred thirty-eight thousand, nine hundred forty-seven".