65780087 has 4 divisors (see below), whose sum is σ = 65825640. Its totient is φ = 65734536.

The previous prime is 65780063. The next prime is 65780093. The reversal of 65780087 is 78008756.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65780087 - 2²⁴ = 49002871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65780027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20537 + ... + 23522.

It is an arithmetic number, because the mean of its divisors is an integer number (16456410).

Almost surely, 2^65780087 is an apocalyptic number.

65780087 is a deficient number, since it is larger than the sum of its proper divisors (45553).

65780087 is a wasteful number, since it uses less digits than its factorization.

65780087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45552.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 65780087 is about 8110.4924018212. The cubic root of 65780087 is about 403.6746535140.

The spelling of 65780087 in words is "sixty-five million, seven hundred eighty thousand, eighty-seven".