72472191 has 8 divisors (see below), whose sum is σ = 105414144. Its totient is φ = 43922520.

The previous prime is 72472129. The next prime is 72472193. The reversal of 72472191 is 19127427.

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

It is not a de Polignac number, because 72472191 - 2¹⁰ = 72471167 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2196127 = 72472191 / (7 + 2 + 4 + 7 + 2 + 1 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72472193) 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, 1098031 + ... + 1098096.

It is an arithmetic number, because the mean of its divisors is an integer number (13176768).

Almost surely, 2^72472191 is an apocalyptic number.

72472191 is a deficient number, since it is larger than the sum of its proper divisors (32941953).

72472191 is a wasteful number, since it uses less digits than its factorization.

72472191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196141.

The product of its digits is 7056, while the sum is 33.

The square root of 72472191 is about 8513.0600256312. The cubic root of 72472191 is about 416.9242252575.

The spelling of 72472191 in words is "seventy-two million, four hundred seventy-two thousand, one hundred ninety-one".