72281539 has 8 divisors (see below), whose sum is σ = 79383600. Its totient is φ = 65268000.

The previous prime is 72281537. The next prime is 72281557. The reversal of 72281539 is 93518227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72281539 - 2¹ = 72281537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72281498 and 72281507.

It is not an unprimeable number, because it can be changed into a prime (72281533) 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, 20412 + ... + 23689.

It is an arithmetic number, because the mean of its divisors is an integer number (9922950).

Almost surely, 2^72281539 is an apocalyptic number.

72281539 is a deficient number, since it is larger than the sum of its proper divisors (7102061).

72281539 is a wasteful number, since it uses less digits than its factorization.

72281539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44261.

The product of its digits is 30240, while the sum is 37.

The square root of 72281539 is about 8501.8550328737. The cubic root of 72281539 is about 416.5583044785.

The spelling of 72281539 in words is "seventy-two million, two hundred eighty-one thousand, five hundred thirty-nine".