77998949 has 8 divisors (see below), whose sum is σ = 89472768. Its totient is φ = 66607920.

The previous prime is 77998939. The next prime is 77998969. The reversal of 77998949 is 94989977.

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 77998949 - 2⁸ = 77998693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77998891 and 77998900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77998919) 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, 18662 + ... + 22455.

It is an arithmetic number, because the mean of its divisors is an integer number (11184096).

Almost surely, 2^77998949 is an apocalyptic number.

It is an amenable number.

77998949 is a deficient number, since it is larger than the sum of its proper divisors (11473819).

77998949 is a wasteful number, since it uses less digits than its factorization.

77998949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41395.

The product of its digits is 10287648, while the sum is 62.

The square root of 77998949 is about 8831.7013649693. The cubic root of 77998949 is about 427.2639491166.

The spelling of 77998949 in words is "seventy-seven million, nine hundred ninety-eight thousand, nine hundred forty-nine".