73130520 has 32 divisors (see below), whose sum is σ = 219391920. Its totient is φ = 19501440.

The previous prime is 73130483. The next prime is 73130527. The reversal of 73130520 is 2503137.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73130527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304591 + ... + 304830.

Almost surely, 2^73130520 is an apocalyptic number.

It is an amenable number.

73130520 is an abundant number, since it is smaller than the sum of its proper divisors (146261400).

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

73130520 is a wasteful number, since it uses less digits than its factorization.

73130520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609435 (or 609431 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 73130520 is about 8551.6384395039. The cubic root of 73130520 is about 418.1828523203.

Adding to 73130520 its reverse (2503137), we get a palindrome (75633657).

The spelling of 73130520 in words is "seventy-three million, one hundred thirty thousand, five hundred twenty".