72450209 has 8 divisors (see below), whose sum is σ = 82613160. Its totient is φ = 62942976.

The previous prime is 72450197. The next prime is 72450223. The reversal of 72450209 is 90205427.

It can be written as a sum of positive squares in 4 ways, for example, as 1216609 + 71233600 = 1103^2 + 8440^2 .

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

It is not a de Polignac number, because 72450209 - 2¹⁶ = 72384673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72450269) 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, 163694 + ... + 164135.

It is an arithmetic number, because the mean of its divisors is an integer number (10326645).

Almost surely, 2^72450209 is an apocalyptic number.

It is an amenable number.

72450209 is a deficient number, since it is larger than the sum of its proper divisors (10162951).

72450209 is a wasteful number, since it uses less digits than its factorization.

72450209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327859.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 72450209 is about 8511.7688525946. The cubic root of 72450209 is about 416.8820676844.

The spelling of 72450209 in words is "seventy-two million, four hundred fifty thousand, two hundred nine".