72474217 has 2 divisors, whose sum is σ = 72474218. Its totient is φ = 72474216.

The previous prime is 72474169. The next prime is 72474223. The reversal of 72474217 is 71247427.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70963776 + 1510441 = 8424^2 + 1229^2 .

It is a cyclic number.

It is not a de Polignac number, because 72474217 - 2⁷ = 72474089 is a prime.

It is not a weakly prime, because it can be changed into another prime (72474917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36237108 + 36237109.

It is an arithmetic number, because the mean of its divisors is an integer number (36237109).

Almost surely, 2^72474217 is an apocalyptic number.

It is an amenable number.

72474217 is a deficient number, since it is larger than the sum of its proper divisors (1).

72474217 is an equidigital number, since it uses as much as digits as its factorization.

72474217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21952, while the sum is 34.

The square root of 72474217 is about 8513.1790184396. The cubic root of 72474217 is about 416.9281103368.

The spelling of 72474217 in words is "seventy-two million, four hundred seventy-four thousand, two hundred seventeen".