73221340 has 24 divisors (see below), whose sum is σ = 154081872. Its totient is φ = 29228160.

The previous prime is 73221319. The next prime is 73221341. The reversal of 73221340 is 4312237.

It is a super-2 number, since 2×73221340² = 10722729262791200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73221341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6907 + ... + 13933.

It is an arithmetic number, because the mean of its divisors is an integer number (6420078).

Almost surely, 2^73221340 is an apocalyptic number.

It is an amenable number.

73221340 is an abundant number, since it is smaller than the sum of its proper divisors (80860532).

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

73221340 is a wasteful number, since it uses less digits than its factorization.

73221340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7557 (or 7555 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 73221340 is about 8556.9468854259. The cubic root of 73221340 is about 418.3558929579.

Adding to 73221340 its reverse (4312237), we get a palindrome (77533577).

The spelling of 73221340 in words is "seventy-three million, two hundred twenty-one thousand, three hundred forty".