73209620 has 48 divisors (see below), whose sum is σ = 169646400. Its totient is φ = 26315520.

The previous prime is 73209593. The next prime is 73209629. The reversal of 73209620 is 2690237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73209629) 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, 17711 + ... + 21449.

It is an arithmetic number, because the mean of its divisors is an integer number (3534300).

Almost surely, 2^73209620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 73209620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84823200).

73209620 is an abundant number, since it is smaller than the sum of its proper divisors (96436780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

73209620 is a wasteful number, since it uses less digits than its factorization.

73209620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3848 (or 3846 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 73209620 is about 8556.2620343232. The cubic root of 73209620 is about 418.3335707192. Note that the first 3 decimals are identical.

Adding to 73209620 its reverse (2690237), we get a palindrome (75899857).

The spelling of 73209620 in words is "seventy-three million, two hundred nine thousand, six hundred twenty".