77730665 has 8 divisors (see below), whose sum is σ = 93329088. Its totient is φ = 62149680.

The previous prime is 77730641. The next prime is 77730677. The reversal of 77730665 is 56603777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-77730665 is a prime.

It is a Duffinian number.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 9410 + ... + 15620.

It is an arithmetic number, because the mean of its divisors is an integer number (11666136).

Almost surely, 2^77730665 is an apocalyptic number.

It is an amenable number.

77730665 is a deficient number, since it is larger than the sum of its proper divisors (15598423).

77730665 is a wasteful number, since it uses less digits than its factorization.

77730665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8719.

The product of its (nonzero) digits is 185220, while the sum is 41.

The square root of 77730665 is about 8816.4995888391. The cubic root of 77730665 is about 426.7735161948.

The spelling of 77730665 in words is "seventy-seven million, seven hundred thirty thousand, six hundred sixty-five".