72218871 has 24 divisors (see below), whose sum is σ = 111681024. Its totient is φ = 46587960.

The previous prime is 72218851. The next prime is 72218879. The reversal of 72218871 is 17881227.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-72218871 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72218879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2740 + ... + 12326.

It is an arithmetic number, because the mean of its divisors is an integer number (4653376).

Almost surely, 2^72218871 is an apocalyptic number.

72218871 is a deficient number, since it is larger than the sum of its proper divisors (39462153).

72218871 is an equidigital number, since it uses as much as digits as its factorization.

72218871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9633 (or 9621 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 72218871 is about 8498.1686850756. The cubic root of 72218871 is about 416.4378845017.

The spelling of 72218871 in words is "seventy-two million, two hundred eighteen thousand, eight hundred seventy-one".