73645885920 has 192 divisors, whose sum is σ = 247976515584. Its totient is φ = 18326753280.

The previous prime is 73645885891. The next prime is 73645885931. The reversal of 73645885920 is 2958854637.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371289 + ... + 533991.

It is an arithmetic number, because the mean of its divisors is an integer number (1291544352).

Almost surely, 2^73645885920 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 73645885920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123988257792).

73645885920 is an abundant number, since it is smaller than the sum of its proper divisors (174330629664).

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

73645885920 is a wasteful number, since it uses less digits than its factorization.

73645885920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162785 (or 162777 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 57.

The spelling of 73645885920 in words is "seventy-three billion, six hundred forty-five million, eight hundred eighty-five thousand, nine hundred twenty".