72476892821 has 4 divisors (see below), whose sum is σ = 72895834572. Its totient is φ = 72057951072.

The previous prime is 72476892809. The next prime is 72476892827. The reversal of 72476892821 is 12829867427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12829867427 = 13 ⋅986912879.

It can be written as a sum of positive squares in 2 ways, for example, as 51274620721 + 21202272100 = 226439^2 + 145610^2 .

It is a cyclic number.

It is not a de Polignac number, because 72476892821 - 2³⁰ = 71403150997 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 (72476892827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209470616 + ... + 209470961.

It is an arithmetic number, because the mean of its divisors is an integer number (18223958643).

Almost surely, 2^72476892821 is an apocalyptic number.

It is an amenable number.

72476892821 is a deficient number, since it is larger than the sum of its proper divisors (418941751).

72476892821 is a wasteful number, since it uses less digits than its factorization.

72476892821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418941750.

The product of its digits is 5419008, while the sum is 56.

The spelling of 72476892821 in words is "seventy-two billion, four hundred seventy-six million, eight hundred ninety-two thousand, eight hundred twenty-one".