776577664 has 16 divisors (see below), whose sum is σ = 1547088570. Its totient is φ = 388288768.

The previous prime is 776577661. The next prime is 776577673. The reversal of 776577664 is 466775677.

It can be written as a sum of positive squares in only one way, i.e., 635443264 + 141134400 = 25208^2 + 11880^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (776577661) 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 as a sum of consecutive naturals, namely, 3033379 + ... + 3033634.

Almost surely, 2^776577664 is an apocalyptic number.

It is an amenable number.

776577664 is a deficient number, since it is larger than the sum of its proper divisors (770510906).

776577664 is an equidigital number, since it uses as much as digits as its factorization.

776577664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6067027 (or 6067015 counting only the distinct ones).

The product of its digits is 10372320, while the sum is 55.

The square root of 776577664 is about 27867.1430900263. The cubic root of 776577664 is about 919.1681453627.

The spelling of 776577664 in words is "seven hundred seventy-six million, five hundred seventy-seven thousand, six hundred sixty-four".