77998361 has 8 divisors (see below), whose sum is σ = 90024384. Its totient is φ = 66193200.

The previous prime is 77998357. The next prime is 77998391. The reversal of 77998361 is 16389977.

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

It is a cyclic number.

It is not a de Polignac number, because 77998361 - 2² = 77998357 is a prime.

It is a super-3 number, since 3×77998361³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77998391) by changing a digit.

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, 54455 + ... + 55868.

It is an arithmetic number, because the mean of its divisors is an integer number (11253048).

Almost surely, 2^77998361 is an apocalyptic number.

It is an amenable number.

77998361 is a deficient number, since it is larger than the sum of its proper divisors (12026023).

77998361 is a wasteful number, since it uses less digits than its factorization.

77998361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110431.

The product of its digits is 571536, while the sum is 50.

The square root of 77998361 is about 8831.6680757374. The cubic root of 77998361 is about 427.2628754618.

The spelling of 77998361 in words is "seventy-seven million, nine hundred ninety-eight thousand, three hundred sixty-one".