77989813 has 8 divisors (see below), whose sum is σ = 89557920. Its totient is φ = 67168080.

The previous prime is 77989801. The next prime is 77989817. The reversal of 77989813 is 31898977.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77989813 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 (77989817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186370 + ... + 186787.

It is an arithmetic number, because the mean of its divisors is an integer number (11194740).

Almost surely, 2^77989813 is an apocalyptic number.

It is an amenable number.

77989813 is a deficient number, since it is larger than the sum of its proper divisors (11568107).

77989813 is a wasteful number, since it uses less digits than its factorization.

77989813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373187.

The product of its digits is 762048, while the sum is 52.

The square root of 77989813 is about 8831.1841221888. The cubic root of 77989813 is about 427.2472666873.

The spelling of 77989813 in words is "seventy-seven million, nine hundred eighty-nine thousand, eight hundred thirteen".