72447720 has 32 divisors (see below), whose sum is σ = 217343520. Its totient is φ = 19319360.

The previous prime is 72447719. The next prime is 72447721. The reversal of 72447720 is 2774427.

It is an interprime number because it is at equal distance from previous prime (72447719) and next prime (72447721).

It is not an unprimeable number, because it can be changed into a prime (72447721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301746 + ... + 301985.

It is an arithmetic number, because the mean of its divisors is an integer number (6791985).

Almost surely, 2^72447720 is an apocalyptic number.

It is an amenable number.

72447720 is an abundant number, since it is smaller than the sum of its proper divisors (144895800).

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

72447720 is a wasteful number, since it uses less digits than its factorization.

72447720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603745 (or 603741 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 33.

The square root of 72447720 is about 8511.6226420113. The cubic root of 72447720 is about 416.8772936869.

The spelling of 72447720 in words is "seventy-two million, four hundred forty-seven thousand, seven hundred twenty".