72239731 has 8 divisors (see below), whose sum is σ = 73440000. Its totient is φ = 71044680.

The previous prime is 72239719. The next prime is 72239743. The reversal of 72239731 is 13793227.

It is an interprime number because it is at equal distance from previous prime (72239719) and next prime (72239743).

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 72239731 - 2⁷ = 72239603 is a prime.

It is a super-2 number, since 2×72239731² = 10437157469904722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72239701) 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 7 ways as a sum of consecutive naturals, for example, 34410 + ... + 36448.

It is an arithmetic number, because the mean of its divisors is an integer number (9180000).

Almost surely, 2^72239731 is an apocalyptic number.

72239731 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

72239731 is a deficient number, since it is larger than the sum of its proper divisors (1200269).

72239731 is a wasteful number, since it uses less digits than its factorization.

72239731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2609.

The product of its digits is 15876, while the sum is 34.

The square root of 72239731 is about 8499.3959197110. The cubic root of 72239731 is about 416.4779758605.

The spelling of 72239731 in words is "seventy-two million, two hundred thirty-nine thousand, seven hundred thirty-one".