664777340 has 12 divisors (see below), whose sum is σ = 1396032456. Its totient is φ = 265910928.

The previous prime is 664777327. The next prime is 664777381. The reversal of 664777340 is 43777466.

It is a junction number, because it is equal to n+sod(n) for n = 664777291 and 664777300.

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 3 ways as a sum of consecutive naturals, for example, 16619414 + ... + 16619453.

It is an arithmetic number, because the mean of its divisors is an integer number (116336038).

Almost surely, 2^664777340 is an apocalyptic number.

It is an amenable number.

664777340 is an abundant number, since it is smaller than the sum of its proper divisors (731255116).

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

664777340 is a wasteful number, since it uses less digits than its factorization.

664777340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33238876 (or 33238874 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 44.

The square root of 664777340 is about 25783.2763627899. The cubic root of 664777340 is about 872.7544444994.

The spelling of 664777340 in words is "six hundred sixty-four million, seven hundred seventy-seven thousand, three hundred forty".