72186873502 has 4 divisors (see below), whose sum is σ = 108280310256. Its totient is φ = 36093436750.

The previous prime is 72186873481. The next prime is 72186873503. The reversal of 72186873502 is 20537868127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20537868127 = 7 ⋅2933981161.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72186873503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18046718374 + ... + 18046718377.

It is an arithmetic number, because the mean of its divisors is an integer number (27070077564).

Almost surely, 2^72186873502 is an apocalyptic number.

72186873502 is a deficient number, since it is larger than the sum of its proper divisors (36093436754).

72186873502 is a wasteful number, since it uses less digits than its factorization.

72186873502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36093436753.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 72186873502 in words is "seventy-two billion, one hundred eighty-six million, eight hundred seventy-three thousand, five hundred two".