77968893 has 4 divisors (see below), whose sum is σ = 103958528. Its totient is φ = 51979260.

The previous prime is 77968889. The next prime is 77968903. The reversal of 77968893 is 39886977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77968893 - 2² = 77968889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77968823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12994813 + ... + 12994818.

It is an arithmetic number, because the mean of its divisors is an integer number (25989632).

Almost surely, 2^77968893 is an apocalyptic number.

It is an amenable number.

77968893 is a deficient number, since it is larger than the sum of its proper divisors (25989635).

77968893 is a wasteful number, since it uses less digits than its factorization.

77968893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25989634.

The product of its digits is 4572288, while the sum is 57.

The square root of 77968893 is about 8829.9996036240. Note that the first 3 decimals coincide. The cubic root of 77968893 is about 427.2090616459.

The spelling of 77968893 in words is "seventy-seven million, nine hundred sixty-eight thousand, eight hundred ninety-three".