72071840738 has 4 divisors (see below), whose sum is σ = 108107761110. Its totient is φ = 36035920368.

The previous prime is 72071840669. The next prime is 72071840747. The reversal of 72071840738 is 83704817027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 47185831729 + 24886009009 = 217223^2 + 157753^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72071840692 and 72071840701.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18017960183 + ... + 18017960186.

Almost surely, 2^72071840738 is an apocalyptic number.

72071840738 is a deficient number, since it is larger than the sum of its proper divisors (36035920372).

72071840738 is a wasteful number, since it uses less digits than its factorization.

72071840738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36035920371.

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 72071840738 in words is "seventy-two billion, seventy-one million, eight hundred forty thousand, seven hundred thirty-eight".