72447556 has 12 divisors (see below), whose sum is σ = 127517292. Its totient is φ = 36014048.

The previous prime is 72447553. The next prime is 72447559. The reversal of 72447556 is 65574427.

It is an interprime number because it is at equal distance from previous prime (72447553) and next prime (72447559).

It can be written as a sum of positive squares in 2 ways, for example, as 60996100 + 11451456 = 7810^2 + 3384^2 .

It is not an unprimeable number, because it can be changed into a prime (72447553) by changing a digit.

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, 51655 + ... + 53038.

It is an arithmetic number, because the mean of its divisors is an integer number (10626441).

Almost surely, 2^72447556 is an apocalyptic number.

It is an amenable number.

72447556 is a deficient number, since it is larger than the sum of its proper divisors (55069736).

72447556 is a wasteful number, since it uses less digits than its factorization.

72447556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104870 (or 104868 counting only the distinct ones).

The product of its digits is 235200, while the sum is 40.

The square root of 72447556 is about 8511.6130081201. The cubic root of 72447556 is about 416.8769791247.

The spelling of 72447556 in words is "seventy-two million, four hundred forty-seven thousand, five hundred fifty-six".