72015566 has 16 divisors (see below), whose sum is σ = 124045440. Its totient is φ = 30716280.

The previous prime is 72015539. The next prime is 72015569. The reversal of 72015566 is 66551027.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72015569) 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, 9236 + ... + 15143.

It is an arithmetic number, because the mean of its divisors is an integer number (7752840).

Almost surely, 2^72015566 is an apocalyptic number.

72015566 is a deficient number, since it is larger than the sum of its proper divisors (52029874).

72015566 is a wasteful number, since it uses less digits than its factorization.

72015566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24599.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 72015566 is about 8486.1985600150. The cubic root of 72015566 is about 416.0467426212.

The spelling of 72015566 in words is "seventy-two million, fifteen thousand, five hundred sixty-six".