77008985 has 4 divisors (see below), whose sum is σ = 92410788. Its totient is φ = 61607184.

The previous prime is 77008969. The next prime is 77008993. The reversal of 77008985 is 58980077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58980077 = 13 ⋅4536929.

It can be written as a sum of positive squares in 2 ways, for example, as 58920976 + 18088009 = 7676^2 + 4253^2 .

It is a cyclic number.

It is not a de Polignac number, because 77008985 - 2⁴ = 77008969 is a prime.

It is a Duffinian 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, 7700894 + ... + 7700903.

It is an arithmetic number, because the mean of its divisors is an integer number (23102697).

Almost surely, 2^77008985 is an apocalyptic number.

It is an amenable number.

77008985 is a deficient number, since it is larger than the sum of its proper divisors (15401803).

77008985 is a wasteful number, since it uses less digits than its factorization.

77008985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15401802.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 77008985 is about 8775.4763403476. The cubic root of 77008985 is about 425.4486335185.

The spelling of 77008985 in words is "seventy-seven million, eight thousand, nine hundred eighty-five".