73052640 has 144 divisors (see below), whose sum is σ = 252343728. Its totient is φ = 19243008.

The previous prime is 73052627. The next prime is 73052659. The reversal of 73052640 is 4625037.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 139419 + ... + 139941.

It is an arithmetic number, because the mean of its divisors is an integer number (1752387).

Almost surely, 2^73052640 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 73052640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126171864).

73052640 is an abundant number, since it is smaller than the sum of its proper divisors (179291088).

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

73052640 is a wasteful number, since it uses less digits than its factorization.

73052640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 73052640 is about 8547.0837131738. The cubic root of 73052640 is about 418.0343523121.

Adding to 73052640 its reverse (4625037), we get a palindrome (77677677).

The spelling of 73052640 in words is "seventy-three million, fifty-two thousand, six hundred forty".