73656609 has 16 divisors (see below), whose sum is σ = 105989184. Its totient is φ = 45230400.

The previous prime is 73656593. The next prime is 73656613. The reversal of 73656609 is 90665637.

It is not a de Polignac number, because 73656609 - 2⁴ = 73656593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73656629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19354 + ... + 22844.

It is an arithmetic number, because the mean of its divisors is an integer number (6624324).

Almost surely, 2^73656609 is an apocalyptic number.

It is an amenable number.

73656609 is a deficient number, since it is larger than the sum of its proper divisors (32332575).

73656609 is a wasteful number, since it uses less digits than its factorization.

73656609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048.

The product of its (nonzero) digits is 204120, while the sum is 42.

The square root of 73656609 is about 8582.3428619463. The cubic root of 73656609 is about 419.1832369548.

Subtracting 73656609 from its reverse (90665637), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 73656609 in words is "seventy-three million, six hundred fifty-six thousand, six hundred nine".