72973821 has 8 divisors (see below), whose sum is σ = 97669440. Its totient is φ = 48463712.

The previous prime is 72973811. The next prime is 72973829. The reversal of 72973821 is 12837927.

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

It is a cyclic number.

It is not a de Polignac number, because 72973821 - 2¹⁰ = 72972797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72973821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72973829) 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, 45456 + ... + 47033.

It is an arithmetic number, because the mean of its divisors is an integer number (12208680).

Almost surely, 2^72973821 is an apocalyptic number.

It is an amenable number.

72973821 is a deficient number, since it is larger than the sum of its proper divisors (24695619).

72973821 is a wasteful number, since it uses less digits than its factorization.

72973821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92755.

The product of its digits is 42336, while the sum is 39.

The square root of 72973821 is about 8542.4715978457. The cubic root of 72973821 is about 417.8839543403.

The spelling of 72973821 in words is "seventy-two million, nine hundred seventy-three thousand, eight hundred twenty-one".