72489820838 has 4 divisors (see below), whose sum is σ = 108734731260. Its totient is φ = 36244910418.

The previous prime is 72489820831. The next prime is 72489820847. The reversal of 72489820838 is 83802898427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83802898427 = 61 ⋅1373818007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72489820831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18122455208 + ... + 18122455211.

It is an arithmetic number, because the mean of its divisors is an integer number (27183682815).

Almost surely, 2^72489820838 is an apocalyptic number.

72489820838 is a deficient number, since it is larger than the sum of its proper divisors (36244910422).

72489820838 is a wasteful number, since it uses less digits than its factorization.

72489820838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36244910421.

The product of its (nonzero) digits is 12386304, while the sum is 59.

The spelling of 72489820838 in words is "seventy-two billion, four hundred eighty-nine million, eight hundred twenty thousand, eight hundred thirty-eight".