72247818 has 16 divisors (see below), whose sum is σ = 144694656. Its totient is φ = 24049440.

The previous prime is 72247817. The next prime is 72247837. The reversal of 72247818 is 81874227.

It is a super-2 number, since 2×72247818² = 10439494411522248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72247817) 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 7 ways as a sum of consecutive naturals, for example, 3346 + ... + 12477.

It is an arithmetic number, because the mean of its divisors is an integer number (9043416).

Almost surely, 2^72247818 is an apocalyptic number.

72247818 is an abundant number, since it is smaller than the sum of its proper divisors (72446838).

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

72247818 is a wasteful number, since it uses less digits than its factorization.

72247818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16589.

The product of its digits is 50176, while the sum is 39.

The square root of 72247818 is about 8499.8716460897. The cubic root of 72247818 is about 416.4935163933.

The spelling of 72247818 in words is "seventy-two million, two hundred forty-seven thousand, eight hundred eighteen".