72281418 has 16 divisors (see below), whose sum is σ = 157705056. Its totient is φ = 21903440.

The previous prime is 72281413. The next prime is 72281423. The reversal of 72281418 is 81418227.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72281413) and next prime (72281423).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72281413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547521 + ... + 547652.

It is an arithmetic number, because the mean of its divisors is an integer number (9856566).

Almost surely, 2^72281418 is an apocalyptic number.

72281418 is an abundant number, since it is smaller than the sum of its proper divisors (85423638).

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

72281418 is a wasteful number, since it uses less digits than its factorization.

72281418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095189.

The product of its digits is 7168, while the sum is 33.

The square root of 72281418 is about 8501.8479167767. The cubic root of 72281418 is about 416.5580720375.

It can be divided in two parts, 7228 and 1418, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 72281418 in words is "seventy-two million, two hundred eighty-one thousand, four hundred eighteen".