789664 has 12 divisors (see below), whose sum is σ = 1554714. Its totient is φ = 394816.

The previous prime is 789653. The next prime is 789671. The reversal of 789664 is 466987.

789664 = T₁₂₄ + T₁₂₅ + ... + T₁₈₇.

It can be written as a sum of positive squares in only one way, i.e., 547600 + 242064 = 740^2 + 492^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12307 + ... + 12370.

2⁷⁸⁹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

789664 is a deficient number, since it is larger than the sum of its proper divisors (765050).

789664 is a wasteful number, since it uses less digits than its factorization.

789664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24687 (or 24679 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 789664 is about 888.6304068622. The cubic root of 789664 is about 92.4302469020.

The spelling of 789664 in words is "seven hundred eighty-nine thousand, six hundred sixty-four".