72180996 has 12 divisors (see below), whose sum is σ = 168422352. Its totient is φ = 24060328.

The previous prime is 72180991. The next prime is 72181007. The reversal of 72180996 is 69908127.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (72180991) 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, 3007530 + ... + 3007553.

It is an arithmetic number, because the mean of its divisors is an integer number (14035196).

Almost surely, 2^72180996 is an apocalyptic number.

It is an amenable number.

72180996 is an abundant number, since it is smaller than the sum of its proper divisors (96241356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72180996 is a wasteful number, since it uses less digits than its factorization.

72180996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6015090 (or 6015088 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 72180996 is about 8495.9399715393. The cubic root of 72180996 is about 416.3650718478.

The spelling of 72180996 in words is "seventy-two million, one hundred eighty thousand, nine hundred ninety-six".