73620021 has 16 divisors (see below), whose sum is σ = 101295360. Its totient is φ = 47536320.

The previous prime is 73619983. The next prime is 73620037. The reversal of 73620021 is 12002637.

It is a happy number.

It is not a de Polignac number, because 73620021 - 2¹⁵ = 73587253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73620021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73620061) 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, 9631 + ... + 15491.

It is an arithmetic number, because the mean of its divisors is an integer number (6330960).

Almost surely, 2^73620021 is an apocalyptic number.

It is an amenable number.

73620021 is a deficient number, since it is larger than the sum of its proper divisors (27675339).

73620021 is a wasteful number, since it uses less digits than its factorization.

73620021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 73620021 is about 8580.2110113913. The cubic root of 73620021 is about 419.1138174477.

Adding to 73620021 its reverse (12002637), we get a palindrome (85622658).

The spelling of 73620021 in words is "seventy-three million, six hundred twenty thousand, twenty-one".