72542237 has 8 divisors (see below), whose sum is σ = 75726552. Its totient is φ = 69422400.

The previous prime is 72542233. The next prime is 72542251. The reversal of 72542237 is 73224527.

It can be written as a sum of positive squares in 4 ways, for example, as 26925721 + 45616516 = 5189^2 + 6754^2 .

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 72542237 - 2² = 72542233 is a prime.

It is a super-2 number, since 2×72542237² = 10524752297928338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72542231) 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, 13814 + ... + 18327.

It is an arithmetic number, because the mean of its divisors is an integer number (9465819).

Almost surely, 2^72542237 is an apocalyptic number.

It is an amenable number.

72542237 is a deficient number, since it is larger than the sum of its proper divisors (3184315).

72542237 is a wasteful number, since it uses less digits than its factorization.

72542237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32239.

The product of its digits is 23520, while the sum is 32.

The square root of 72542237 is about 8517.1730638751. The cubic root of 72542237 is about 417.0585042143.

The spelling of 72542237 in words is "seventy-two million, five hundred forty-two thousand, two hundred thirty-seven".