774656640 has 96 divisors (see below), whose sum is σ = 2675006100. Its totient is φ = 206573568.

The previous prime is 774656633. The next prime is 774656677. The reversal of 774656640 is 46656477.

It is a happy number.

774656640 is a `hidden beast` number, since 7 + 7 + 46 + 566 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 771061824 + 3594816 = 27768^2 + 1896^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 61485 + ... + 73004.

Almost surely, 2^774656640 is an apocalyptic number.

It is an amenable number.

774656640 is an abundant number, since it is smaller than the sum of its proper divisors (1900349460).

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

774656640 is a wasteful number, since it uses less digits than its factorization.

774656640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134514 (or 134499 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The square root of 774656640 is about 27832.6542032915. The cubic root of 774656640 is about 918.4096026223.

The spelling of 774656640 in words is "seven hundred seventy-four million, six hundred fifty-six thousand, six hundred forty".