73131630 has 64 divisors (see below), whose sum is σ = 206212608. Its totient is φ = 16364160.

The previous prime is 73131623. The next prime is 73131631. The reversal of 73131630 is 3613137.

73131630 = 138² + 139² + ... + 605².

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 73131630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73131631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4234 + ... + 12813.

It is an arithmetic number, because the mean of its divisors is an integer number (3222072).

Almost surely, 2^73131630 is an apocalyptic number.

73131630 is an abundant number, since it is smaller than the sum of its proper divisors (133080978).

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

73131630 is a wasteful number, since it uses less digits than its factorization.

73131630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17081.

The product of its (nonzero) digits is 1134, while the sum is 24.

The square root of 73131630 is about 8551.7033391015. The cubic root of 73131630 is about 418.1849680836.

Adding to 73131630 its reverse (3613137), we get a palindrome (76744767).

The spelling of 73131630 in words is "seventy-three million, one hundred thirty-one thousand, six hundred thirty".