775664 has 10 divisors (see below), whose sum is σ = 1502880. Its totient is φ = 387824.

The previous prime is 775661. The next prime is 775669. The reversal of 775664 is 466577.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24224 + ... + 24255.

It is an arithmetic number, because the mean of its divisors is an integer number (150288).

2⁷⁷⁵⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

775664 is a deficient number, since it is larger than the sum of its proper divisors (727216).

775664 is a wasteful number, since it uses less digits than its factorization.

775664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48487 (or 48481 counting only the distinct ones).

The product of its digits is 35280, while the sum is 35.

The square root of 775664 is about 880.7178889974. The cubic root of 775664 is about 91.8807528753.

The spelling of 775664 in words is "seven hundred seventy-five thousand, six hundred sixty-four".