664410780 has 144 divisors (see below), whose sum is σ = 2235044448. Its totient is φ = 158400000.

The previous prime is 664410757. The next prime is 664410823. The reversal of 664410780 is 87014466.

664410780 is a `hidden beast` number, since 6 + 644 + 1 + 0 + 7 + 8 + 0 = 666.

664410780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118030 + ... + 123530.

It is an arithmetic number, because the mean of its divisors is an integer number (15521142).

Almost surely, 2^664410780 is an apocalyptic number.

664410780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664410780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1117522224).

664410780 is an abundant number, since it is smaller than the sum of its proper divisors (1570633668).

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

664410780 is a wasteful number, since it uses less digits than its factorization.

664410780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5588 (or 5583 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 664410780 is about 25776.1668989010. The cubic root of 664410780 is about 872.5940019628.

It can be divided in two parts, 6644 and 10780, that added together give a square (17424 = 132²).

The spelling of 664410780 in words is "six hundred sixty-four million, four hundred ten thousand, seven hundred eighty".