72466409 has 4 divisors (see below), whose sum is σ = 72600900. Its totient is φ = 72331920.

The previous prime is 72466403. The next prime is 72466451. The reversal of 72466409 is 90466427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39438400 + 33028009 = 6280^2 + 5747^2 .

It is a cyclic number.

It is not a de Polignac number, because 72466409 - 2⁸ = 72466153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72466403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66434 + ... + 67515.

It is an arithmetic number, because the mean of its divisors is an integer number (18150225).

Almost surely, 2^72466409 is an apocalyptic number.

It is an amenable number.

72466409 is a deficient number, since it is larger than the sum of its proper divisors (134491).

72466409 is a wasteful number, since it uses less digits than its factorization.

72466409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134490.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 72466409 is about 8512.7204229905. The cubic root of 72466409 is about 416.9131372345.

The spelling of 72466409 in words is "seventy-two million, four hundred sixty-six thousand, four hundred nine".