73530778321 has 128 divisors (see below), whose sum is σ = 106883481600. Its totient is φ = 49761734400.

The previous prime is 73530778319. The next prime is 73530778339. The reversal of 73530778321 is 12387703537.

It is not a de Polignac number, because 73530778321 - 2¹ = 73530778319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73530778421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 56258550 + ... + 56259856.

It is an arithmetic number, because the mean of its divisors is an integer number (835027200).

Almost surely, 2^73530778321 is an apocalyptic number.

It is an amenable number.

73530778321 is a deficient number, since it is larger than the sum of its proper divisors (33352703279).

73530778321 is a wasteful number, since it uses less digits than its factorization.

73530778321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420 (or 1406 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 46.

The spelling of 73530778321 in words is "seventy-three billion, five hundred thirty million, seven hundred seventy-eight thousand, three hundred twenty-one".