72191836 has 12 divisors (see below), whose sum is σ = 126682528. Its totient is φ = 35996832.

The previous prime is 72191831. The next prime is 72191837. The reversal of 72191836 is 63819127.

It is a super-2 number, since 2×72191836² = 10423322370101792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72191795 and 72191804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72191831) 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, 23121 + ... + 26056.

Almost surely, 2^72191836 is an apocalyptic number.

It is an amenable number.

72191836 is a deficient number, since it is larger than the sum of its proper divisors (54490692).

72191836 is a wasteful number, since it uses less digits than its factorization.

72191836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49548 (or 49546 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 72191836 is about 8496.5778993663. The cubic root of 72191836 is about 416.3859137670.

The spelling of 72191836 in words is "seventy-two million, one hundred ninety-one thousand, eight hundred thirty-six".