64780 has 24 divisors (see below), whose sum is σ = 141120. Its totient is φ = 24960.

The previous prime is 64763. The next prime is 64781. The reversal of 64780 is 8746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 781 + ... + 859.

It is an arithmetic number, because the mean of its divisors is an integer number (5880).

2⁶⁴⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70560).

64780 is an abundant number, since it is smaller than the sum of its proper divisors (76340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64780 is a wasteful number, since it uses less digits than its factorization.

64780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 64780 is about 254.5191544855. The cubic root of 64780 is about 40.1618442776.

Subtracting from 64780 its product of nonzero digits (1344), we obtain a palindrome (63436).

It can be divided in two parts, 647 and 80, that added together give a palindrome (727).

The spelling of 64780 in words is "sixty-four thousand, seven hundred eighty".