72235818 has 24 divisors (see below), whose sum is σ = 157337856. Its totient is φ = 23951400.

The previous prime is 72235817. The next prime is 72235837. The reversal of 72235818 is 81853227.

72235818 is a `hidden beast` number, since 72 + 2 + 3 + 581 + 8 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72235811) 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 11 ways as a sum of consecutive naturals, for example, 7068 + ... + 13943.

It is an arithmetic number, because the mean of its divisors is an integer number (6555744).

Almost surely, 2^72235818 is an apocalyptic number.

72235818 is an abundant number, since it is smaller than the sum of its proper divisors (85102038).

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

72235818 is a wasteful number, since it uses less digits than its factorization.

72235818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21210 (or 21207 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 72235818 is about 8499.1657237637. The cubic root of 72235818 is about 416.4704559555.

It can be divided in two parts, 7223 and 5818, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 72235818 in words is "seventy-two million, two hundred thirty-five thousand, eight hundred eighteen".