73009821 has 8 divisors (see below), whose sum is σ = 97393504. Its totient is φ = 48649680.

The previous prime is 73009813. The next prime is 73009831. The reversal of 73009821 is 12890037.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 73009821 - 2³ = 73009813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73009801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3486 + ... + 12576.

It is an arithmetic number, because the mean of its divisors is an integer number (12174188).

Almost surely, 2^73009821 is an apocalyptic number.

It is an amenable number.

73009821 is a deficient number, since it is larger than the sum of its proper divisors (24383683).

73009821 is a wasteful number, since it uses less digits than its factorization.

73009821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11771.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 73009821 is about 8544.5784565419. The cubic root of 73009821 is about 417.9526609394.

Adding to 73009821 its reverse (12890037), we get a palindrome (85899858).

The spelling of 73009821 in words is "seventy-three million, nine thousand, eight hundred twenty-one".