72117448 has 16 divisors (see below), whose sum is σ = 145621980. Its totient is φ = 33284928.

The previous prime is 72117431. The next prime is 72117467. The reversal of 72117448 is 84471127.

It can be written as a sum of positive squares in 2 ways, for example, as 71267364 + 850084 = 8442^2 + 922^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346615 + ... + 346822.

Almost surely, 2^72117448 is an apocalyptic number.

It is an amenable number.

72117448 is an abundant number, since it is smaller than the sum of its proper divisors (73504532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72117448 is a wasteful number, since it uses less digits than its factorization.

72117448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693456 (or 693452 counting only the distinct ones).

The product of its digits is 12544, while the sum is 34.

The square root of 72117448 is about 8492.1992440121. The cubic root of 72117448 is about 416.2428469885.

The spelling of 72117448 in words is "seventy-two million, one hundred seventeen thousand, four hundred forty-eight".