72819121 has 8 divisors (see below), whose sum is σ = 75032064. Its totient is φ = 70633920.

The previous prime is 72819113. The next prime is 72819193. The reversal of 72819121 is 12191827.

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 72819121 - 2³ = 72819113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72819221) 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, 1545 + ... + 12166.

It is an arithmetic number, because the mean of its divisors is an integer number (9379008).

Almost surely, 2^72819121 is an apocalyptic number.

It is an amenable number.

72819121 is a deficient number, since it is larger than the sum of its proper divisors (2212943).

72819121 is a wasteful number, since it uses less digits than its factorization.

72819121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13871.

The product of its digits is 2016, while the sum is 31.

The square root of 72819121 is about 8533.4120373975. The cubic root of 72819121 is about 417.5884493540.

The spelling of 72819121 in words is "seventy-two million, eight hundred nineteen thousand, one hundred twenty-one".