72163947 has 8 divisors (see below), whose sum is σ = 97070544. Its totient is φ = 47683328.

The previous prime is 72163921. The next prime is 72163961. The reversal of 72163947 is 74936127.

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 72163947 - 2¹² = 72159851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72163447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106098 + ... + 106775.

It is an arithmetic number, because the mean of its divisors is an integer number (12133818).

Almost surely, 2^72163947 is an apocalyptic number.

72163947 is a deficient number, since it is larger than the sum of its proper divisors (24906597).

72163947 is a wasteful number, since it uses less digits than its factorization.

72163947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212989.

The product of its digits is 63504, while the sum is 39.

The square root of 72163947 is about 8494.9365506753. The cubic root of 72163947 is about 416.3322877473.

The spelling of 72163947 in words is "seventy-two million, one hundred sixty-three thousand, nine hundred forty-seven".