64780687 has 2 divisors, whose sum is σ = 64780688. Its totient is φ = 64780686.

The previous prime is 64780657. The next prime is 64780721. The reversal of 64780687 is 78608746.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64780687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64780657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32390343 + 32390344.

It is an arithmetic number, because the mean of its divisors is an integer number (32390344).

Almost surely, 2^64780687 is an apocalyptic number.

64780687 is a deficient number, since it is larger than the sum of its proper divisors (1).

64780687 is an equidigital number, since it uses as much as digits as its factorization.

64780687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 64780687 is about 8048.6450412476. The cubic root of 64780687 is about 401.6198625085.

The spelling of 64780687 in words is "sixty-four million, seven hundred eighty thousand, six hundred eighty-seven".