72881986 has 16 divisors (see below), whose sum is σ = 120081600. Its totient is φ = 33021648.

The previous prime is 72881953. The next prime is 72881989. The reversal of 72881986 is 68918827.

It is not an unprimeable number, because it can be changed into a prime (72881989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40821 + ... + 42568.

It is an arithmetic number, because the mean of its divisors is an integer number (7505100).

Almost surely, 2^72881986 is an apocalyptic number.

72881986 is a deficient number, since it is larger than the sum of its proper divisors (47199614).

72881986 is a wasteful number, since it uses less digits than its factorization.

72881986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83433.

The product of its digits is 387072, while the sum is 49.

The square root of 72881986 is about 8537.0947048747. The cubic root of 72881986 is about 417.7085833094.

The spelling of 72881986 in words is "seventy-two million, eight hundred eighty-one thousand, nine hundred eighty-six".