72344537 has 4 divisors (see below), whose sum is σ = 76600116. Its totient is φ = 68088960.

The previous prime is 72344491. The next prime is 72344539. The reversal of 72344537 is 73544327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73544327 = 2153 ⋅34159.

It can be written as a sum of positive squares in 2 ways, for example, as 24167056 + 48177481 = 4916^2 + 6941^2 .

It is a cyclic number.

It is not a de Polignac number, because 72344537 - 2¹⁸ = 72082393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72344497 and 72344506.

It is not an unprimeable number, because it can be changed into a prime (72344539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2127764 + ... + 2127797.

It is an arithmetic number, because the mean of its divisors is an integer number (19150029).

Almost surely, 2^72344537 is an apocalyptic number.

It is an amenable number.

72344537 is a deficient number, since it is larger than the sum of its proper divisors (4255579).

72344537 is a wasteful number, since it uses less digits than its factorization.

72344537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4255578.

The product of its digits is 70560, while the sum is 35.

The square root of 72344537 is about 8505.5591820879. The cubic root of 72344537 is about 416.6792884354.

The spelling of 72344537 in words is "seventy-two million, three hundred forty-four thousand, five hundred thirty-seven".