72489609 has 12 divisors (see below), whose sum is σ = 105008436. Its totient is φ = 48187392.

The previous prime is 72489607. The next prime is 72489631. The reversal of 72489609 is 90698427.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57836025 + 14653584 = 7605^2 + 3828^2 .

It is not a de Polignac number, because 72489609 - 2¹ = 72489607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72489607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8232 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (8750703).

Almost surely, 2^72489609 is an apocalyptic number.

It is an amenable number.

72489609 is a deficient number, since it is larger than the sum of its proper divisors (32518827).

72489609 is a wasteful number, since it uses less digits than its factorization.

72489609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23176 (or 23173 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 72489609 is about 8514.0829805681. The cubic root of 72489609 is about 416.9576238359.

The spelling of 72489609 in words is "seventy-two million, four hundred eighty-nine thousand, six hundred nine".