72756427 has 4 divisors (see below), whose sum is σ = 74531016. Its totient is φ = 70981840.

The previous prime is 72756421. The next prime is 72756433. The reversal of 72756427 is 72465727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72465727 = 2659 ⋅27253.

It is an interprime number because it is at equal distance from previous prime (72756421) and next prime (72756433).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72756427 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72756427.

It is not an unprimeable number, because it can be changed into a prime (72756421) 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 3 ways as a sum of consecutive naturals, for example, 887233 + ... + 887314.

It is an arithmetic number, because the mean of its divisors is an integer number (18632754).

Almost surely, 2^72756427 is an apocalyptic number.

72756427 is a deficient number, since it is larger than the sum of its proper divisors (1774589).

72756427 is a wasteful number, since it uses less digits than its factorization.

72756427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774588.

The product of its digits is 164640, while the sum is 40.

The square root of 72756427 is about 8529.7378037077. The cubic root of 72756427 is about 417.4685732975.

The spelling of 72756427 in words is "seventy-two million, seven hundred fifty-six thousand, four hundred twenty-seven".