73143720 has 96 divisors (see below), whose sum is σ = 256019400. Its totient is φ = 18003456.

The previous prime is 73143701. The next prime is 73143727. The reversal of 73143720 is 2734137.

It can be written as a sum of positive squares in 4 ways, for example, as 67469796 + 5673924 = 8214^2 + 2382^2 .

It is not an unprimeable number, because it can be changed into a prime (73143727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3135 + ... + 12494.

Almost surely, 2^73143720 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 73143720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128009700).

73143720 is an abundant number, since it is smaller than the sum of its proper divisors (182875680).

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

73143720 is a wasteful number, since it uses less digits than its factorization.

73143720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15659 (or 15652 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 73143720 is about 8552.4101866082. The cubic root of 73143720 is about 418.2080113627.

Adding to 73143720 its reverse (2734137), we get a palindrome (75877857).

The spelling of 73143720 in words is "seventy-three million, one hundred forty-three thousand, seven hundred twenty".