72100843 has 4 divisors (see below), whose sum is σ = 72169360. Its totient is φ = 72032328.

The previous prime is 72100799. The next prime is 72100849. The reversal of 72100843 is 34800127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34800127 = 23 ⋅1513049.

It is a cyclic number.

It is not a de Polignac number, because 72100843 - 2¹³ = 72092651 is a prime.

It is a super-3 number, since 3×72100843³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72100849) 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, 32655 + ... + 34792.

It is an arithmetic number, because the mean of its divisors is an integer number (18042340).

Almost surely, 2^72100843 is an apocalyptic number.

72100843 is a deficient number, since it is larger than the sum of its proper divisors (68517).

72100843 is a wasteful number, since it uses less digits than its factorization.

72100843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68516.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 72100843 is about 8491.2215257877. The cubic root of 72100843 is about 416.2108979793.

The spelling of 72100843 in words is "seventy-two million, one hundred thousand, eight hundred forty-three".