77840668 has 12 divisors (see below), whose sum is σ = 136353672. Its totient is φ = 38882480.

The previous prime is 77840639. The next prime is 77840677. The reversal of 77840668 is 86604877.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4555 + ... + 13282.

It is an arithmetic number, because the mean of its divisors is an integer number (11362806).

Almost surely, 2^77840668 is an apocalyptic number.

It is an amenable number.

77840668 is a deficient number, since it is larger than the sum of its proper divisors (58513004).

77840668 is a wasteful number, since it uses less digits than its factorization.

77840668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18932 (or 18930 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 77840668 is about 8822.7358568644. The cubic root of 77840668 is about 426.9747419642.

The spelling of 77840668 in words is "seventy-seven million, eight hundred forty thousand, six hundred sixty-eight".