72186844 has 6 divisors (see below), whose sum is σ = 126326984. Its totient is φ = 36093420.

The previous prime is 72186839. The next prime is 72186859. The reversal of 72186844 is 44868127.

It is a junction number, because it is equal to n+sod(n) for n = 72186797 and 72186806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9023352 + ... + 9023359.

Almost surely, 2^72186844 is an apocalyptic number.

It is an amenable number.

72186844 is a deficient number, since it is larger than the sum of its proper divisors (54140140).

72186844 is a wasteful number, since it uses less digits than its factorization.

72186844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18046715 (or 18046713 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 72186844 is about 8496.2841289590. The cubic root of 72186844 is about 416.3763159763.

The spelling of 72186844 in words is "seventy-two million, one hundred eighty-six thousand, eight hundred forty-four".