73012720 has 80 divisors (see below), whose sum is σ = 191639520. Its totient is φ = 25625600.

The previous prime is 73012711. The next prime is 73012721. The reversal of 73012720 is 2721037.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 73012691 and 73012700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73012721) 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, 24090 + ... + 26950.

It is an arithmetic number, because the mean of its divisors is an integer number (2395494).

Almost surely, 2^73012720 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 73012720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95819760).

73012720 is an abundant number, since it is smaller than the sum of its proper divisors (118626800).

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

73012720 is a wasteful number, since it uses less digits than its factorization.

73012720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914 (or 2908 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 73012720 is about 8544.7480945900. The cubic root of 73012720 is about 417.9581927464.

Adding to 73012720 its reverse (2721037), we get a palindrome (75733757).

The spelling of 73012720 in words is "seventy-three million, twelve thousand, seven hundred twenty".