73305621 has 16 divisors (see below), whose sum is σ = 111537600. Its totient is φ = 47548944.

The previous prime is 73305619. The next prime is 73305641. The reversal of 73305621 is 12650337.

It is a happy number.

73305621 is a `hidden beast` number, since 7 + 3 + 30 + 5 + 621 = 666.

It is not a de Polignac number, because 73305621 - 2¹ = 73305619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73305611) 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 15 ways as a sum of consecutive naturals, for example, 35691 + ... + 37688.

It is an arithmetic number, because the mean of its divisors is an integer number (6971100).

Almost surely, 2^73305621 is an apocalyptic number.

It is an amenable number.

73305621 is a deficient number, since it is larger than the sum of its proper divisors (38231979).

73305621 is a wasteful number, since it uses less digits than its factorization.

73305621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73425 (or 73419 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 73305621 is about 8561.8701812163. The cubic root of 73305621 is about 418.5163467876.

Adding to 73305621 its reverse (12650337), we get a palindrome (85955958).

The spelling of 73305621 in words is "seventy-three million, three hundred five thousand, six hundred twenty-one".