72936021 has 8 divisors (see below), whose sum is σ = 97292320. Its totient is φ = 48601872.

The previous prime is 72935983. The next prime is 72936023. The reversal of 72936021 is 12063927.

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

It is not a de Polignac number, because 72936021 - 2¹⁰ = 72934997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72936021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72936023) 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, 5031 + ... + 13083.

It is an arithmetic number, because the mean of its divisors is an integer number (12161540).

Almost surely, 2^72936021 is an apocalyptic number.

It is an amenable number.

72936021 is a deficient number, since it is larger than the sum of its proper divisors (24356299).

72936021 is a wasteful number, since it uses less digits than its factorization.

72936021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11075.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 72936021 is about 8540.2588368269. The cubic root of 72936021 is about 417.8117880873.

Adding to 72936021 its reverse (12063927), we get a palindrome (84999948).

The spelling of 72936021 in words is "seventy-two million, nine hundred thirty-six thousand, twenty-one".