72787716 has 36 divisors (see below), whose sum is σ = 186518332. Its totient is φ = 23929344.

The previous prime is 72787703. The next prime is 72787717. The reversal of 72787716 is 61778727.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15634116 + 57153600 = 3954^2 + 7560^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (72787717) by changing a digit.

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, 11221 + ... + 16476.

Almost surely, 2^72787716 is an apocalyptic number.

It is an amenable number.

72787716 is an abundant number, since it is smaller than the sum of its proper divisors (113730616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72787716 is a wasteful number, since it uses less digits than its factorization.

72787716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27780 (or 27775 counting only the distinct ones).

The product of its digits is 230496, while the sum is 45.

The square root of 72787716 is about 8531.5717192086. The cubic root of 72787716 is about 417.5284090294.

The spelling of 72787716 in words is "seventy-two million, seven hundred eighty-seven thousand, seven hundred sixteen".