72218355 has 16 divisors (see below), whose sum is σ = 126054144. Its totient is φ = 35014880.

The previous prime is 72218353. The next prime is 72218369. The reversal of 72218355 is 55381227.

It is not a de Polignac number, because 72218355 - 2¹ = 72218353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (72218353) 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 15 ways as a sum of consecutive naturals, for example, 218679 + ... + 219008.

It is an arithmetic number, because the mean of its divisors is an integer number (7878384).

Almost surely, 2^72218355 is an apocalyptic number.

72218355 is a deficient number, since it is larger than the sum of its proper divisors (53835789).

72218355 is a wasteful number, since it uses less digits than its factorization.

72218355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437706.

The product of its digits is 16800, while the sum is 33.

The square root of 72218355 is about 8498.1383255393. The cubic root of 72218355 is about 416.4368926905.

It can be divided in two parts, 7221 and 8355, that added together give a triangular number (15576 = T₁₇₆).

The spelling of 72218355 in words is "seventy-two million, two hundred eighteen thousand, three hundred fifty-five".