72281279 has 16 divisors (see below), whose sum is σ = 84786240. Its totient is φ = 60341760.

The previous prime is 72281267. The next prime is 72281291. The reversal of 72281279 is 97218227.

It is an interprime number because it is at equal distance from previous prime (72281267) and next prime (72281291).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72281279 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72281299) 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, 45767 + ... + 47319.

It is an arithmetic number, because the mean of its divisors is an integer number (5299140).

Almost surely, 2^72281279 is an apocalyptic number.

72281279 is a deficient number, since it is larger than the sum of its proper divisors (12504961).

72281279 is a wasteful number, since it uses less digits than its factorization.

72281279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730.

The product of its digits is 28224, while the sum is 38.

The square root of 72281279 is about 8501.8397420794. The cubic root of 72281279 is about 416.5578050182.

The spelling of 72281279 in words is "seventy-two million, two hundred eighty-one thousand, two hundred seventy-nine".