72180870 has 16 divisors (see below), whose sum is σ = 173234160. Its totient is φ = 19248224.

The previous prime is 72180853. The next prime is 72180883. The reversal of 72180870 is 7808127.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1202985 + ... + 1203044.

It is an arithmetic number, because the mean of its divisors is an integer number (10827135).

Almost surely, 2^72180870 is an apocalyptic number.

72180870 is an abundant number, since it is smaller than the sum of its proper divisors (101053290).

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

72180870 is a wasteful number, since it uses less digits than its factorization.

72180870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406039.

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 72180870 is about 8495.9325562295. The cubic root of 72180870 is about 416.3648295771.

Adding to 72180870 its reverse (7808127), we get a palindrome (79988997).

The spelling of 72180870 in words is "seventy-two million, one hundred eighty thousand, eight hundred seventy".