72015986 has 24 divisors (see below), whose sum is σ = 129063276. Its totient is φ = 30028320.

The previous prime is 72015971. The next prime is 72015997. The reversal of 72015986 is 68951027.

It can be written as a sum of positive squares in 2 ways, for example, as 71149225 + 866761 = 8435^2 + 931^2 .

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 11 ways as a sum of consecutive naturals, for example, 6305 + ... + 13556.

Almost surely, 2^72015986 is an apocalyptic number.

72015986 is a deficient number, since it is larger than the sum of its proper divisors (57047290).

72015986 is a wasteful number, since it uses less digits than its factorization.

72015986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19914 (or 19907 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 72015986 is about 8486.2233060414. The cubic root of 72015986 is about 416.0475514246.

The spelling of 72015986 in words is "seventy-two million, fifteen thousand, nine hundred eighty-six".