72016655 has 4 divisors (see below), whose sum is σ = 86419992. Its totient is φ = 57613320.

The previous prime is 72016619. The next prime is 72016667. The reversal of 72016655 is 55661027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55661027 = 31 ⋅1795517.

It is not a de Polignac number, because 72016655 - 2⁶ = 72016591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7201661 + ... + 7201670.

It is an arithmetic number, because the mean of its divisors is an integer number (21604998).

Almost surely, 2^72016655 is an apocalyptic number.

72016655 is a deficient number, since it is larger than the sum of its proper divisors (14403337).

72016655 is a wasteful number, since it uses less digits than its factorization.

72016655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14403336.

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

The square root of 72016655 is about 8486.2627227773. The cubic root of 72016655 is about 416.0488397263.

The spelling of 72016655 in words is "seventy-two million, sixteen thousand, six hundred fifty-five".