64681775 has 6 divisors (see below), whose sum is σ = 80205432. Its totient is φ = 51745400.

The previous prime is 64681741. The next prime is 64681789. The reversal of 64681775 is 57718646.

It is not a de Polignac number, because 64681775 - 2⁶ = 64681711 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 (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1293611 + ... + 1293660.

It is an arithmetic number, because the mean of its divisors is an integer number (13367572).

Almost surely, 2^64681775 is an apocalyptic number.

64681775 is a deficient number, since it is larger than the sum of its proper divisors (15523657).

64681775 is a wasteful number, since it uses less digits than its factorization.

64681775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587281 (or 2587276 counting only the distinct ones).

The product of its digits is 282240, while the sum is 44.

The square root of 64681775 is about 8042.4980571959. The cubic root of 64681775 is about 401.4153506330.

It can be divided in two parts, 64681 and 775, that added together give a palindrome (65456).

The spelling of 64681775 in words is "sixty-four million, six hundred eighty-one thousand, seven hundred seventy-five".