64778 has 12 divisors (see below), whose sum is σ = 113202. Its totient is φ = 27720.

The previous prime is 64763. The next prime is 64781. The reversal of 64778 is 87746.

It can be written as a sum of positive squares in only one way, i.e., 47089 + 17689 = 217^2 + 133^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 233 + ... + 428.

2⁶⁴⁷⁷⁸ is an apocalyptic number.

64778 is a deficient number, since it is larger than the sum of its proper divisors (48424).

64778 is a wasteful number, since it uses less digits than its factorization.

64778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 670 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 64778 is about 254.5152254778. The cubic root of 64778 is about 40.1614309580.

Subtracting from 64778 its sum of digits (32), we obtain a palindrome (64746).

The spelling of 64778 in words is "sixty-four thousand, seven hundred seventy-eight".