72780016 has 10 divisors (see below), whose sum is σ = 141011312. Its totient is φ = 36390000.

The previous prime is 72779969. The next prime is 72780047. The reversal of 72780016 is 61008727.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 72780016.

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 as a sum of consecutive naturals, namely, 2274360 + ... + 2274391.

Almost surely, 2^72780016 is an apocalyptic number.

It is an amenable number.

72780016 is a deficient number, since it is larger than the sum of its proper divisors (68231296).

72780016 is a wasteful number, since it uses less digits than its factorization.

72780016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4548759 (or 4548753 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 72780016 is about 8531.1204422397. The cubic root of 72780016 is about 417.5136854730.

The spelling of 72780016 in words is "seventy-two million, seven hundred eighty thousand, sixteen".