72644071 has 4 divisors (see below), whose sum is σ = 74333512. Its totient is φ = 70954632.

The previous prime is 72644063. The next prime is 72644083. The reversal of 72644071 is 17044627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17044627 = 2971 ⋅5737.

It is a cyclic number.

It is not a de Polignac number, because 72644071 - 2³ = 72644063 is a prime.

It is a super-2 number, since 2×72644071² = 10554322102906082, 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 (72644471) 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, 844656 + ... + 844741.

It is an arithmetic number, because the mean of its divisors is an integer number (18583378).

Almost surely, 2^72644071 is an apocalyptic number.

72644071 is a deficient number, since it is larger than the sum of its proper divisors (1689441).

72644071 is a wasteful number, since it uses less digits than its factorization.

72644071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689440.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 72644071 is about 8523.1491245900. The cubic root of 72644071 is about 417.2535670248.

Adding to 72644071 its reverse (17044627), we get a palindrome (89688698).

The spelling of 72644071 in words is "seventy-two million, six hundred forty-four thousand, seventy-one".