72756471 has 4 divisors (see below), whose sum is σ = 97008632. Its totient is φ = 48504312.

The previous prime is 72756449. The next prime is 72756479. The reversal of 72756471 is 17465727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17465727 = 3 ⋅5821909.

It is not a de Polignac number, because 72756471 - 2¹⁰ = 72755447 is a prime.

It is a super-3 number, since 3×72756471³ (a number of 25 digits) contains 333 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 (72756479) 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, 12126076 + ... + 12126081.

It is an arithmetic number, because the mean of its divisors is an integer number (24252158).

Almost surely, 2^72756471 is an apocalyptic number.

72756471 is a deficient number, since it is larger than the sum of its proper divisors (24252161).

72756471 is a wasteful number, since it uses less digits than its factorization.

72756471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24252160.

The product of its digits is 82320, while the sum is 39.

The square root of 72756471 is about 8529.7403829190. The cubic root of 72756471 is about 417.4686574532.

The spelling of 72756471 in words is "seventy-two million, seven hundred fifty-six thousand, four hundred seventy-one".