783664 has 20 divisors (see below), whose sum is σ = 1735504. Its totient is φ = 335808.

The previous prime is 783661. The next prime is 783677. The reversal of 783664 is 466387.

It is a super-2 number, since 2×783664² = 1228258529792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (783661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3387 + ... + 3610.

2⁷⁸³⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

783664 is an abundant number, since it is smaller than the sum of its proper divisors (951840).

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

783664 is a wasteful number, since it uses less digits than its factorization.

783664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012 (or 7006 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 783664 is about 885.2479878543. The cubic root of 783664 is about 92.1955512838.

The spelling of 783664 in words is "seven hundred eighty-three thousand, six hundred sixty-four".