72647173 has 2 divisors, whose sum is σ = 72647174. Its totient is φ = 72647172.

The previous prime is 72647149. The next prime is 72647189. The reversal of 72647173 is 37174627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42419169 + 30228004 = 6513^2 + 5498^2 .

It is a cyclic number.

It is not a de Polignac number, because 72647173 - 2¹³ = 72638981 is a prime.

It is a super-2 number, since 2×72647173² = 10555223489783858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72647123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36323586 + 36323587.

It is an arithmetic number, because the mean of its divisors is an integer number (36323587).

Almost surely, 2^72647173 is an apocalyptic number.

It is an amenable number.

72647173 is a deficient number, since it is larger than the sum of its proper divisors (1).

72647173 is an equidigital number, since it uses as much as digits as its factorization.

72647173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 37.

The square root of 72647173 is about 8523.3310976402. The cubic root of 72647173 is about 417.2595060373.

The spelling of 72647173 in words is "seventy-two million, six hundred forty-seven thousand, one hundred seventy-three".