64779 has 16 divisors (see below), whose sum is σ = 102144. Its totient is φ = 36000.

The previous prime is 64763. The next prime is 64781. The reversal of 64779 is 97746.

It is not a de Polignac number, because 64779 - 2⁴ = 64763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354 + ... + 504.

It is an arithmetic number, because the mean of its divisors is an integer number (6384).

2⁶⁴⁷⁷⁹ is an apocalyptic number.

64779 is a deficient number, since it is larger than the sum of its proper divisors (37365).

64779 is a wasteful number, since it uses less digits than its factorization.

64779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178.

The product of its digits is 10584, while the sum is 33.

The square root of 64779 is about 254.5171899892. The cubic root of 64779 is about 40.1616376189.

Subtracting from 64779 its sum of digits (33), we obtain a palindrome (64746).

The spelling of 64779 in words is "sixty-four thousand, seven hundred seventy-nine".