77839983 has 12 divisors (see below), whose sum is σ = 121084600. Its totient is φ = 47901456.

The previous prime is 77839969. The next prime is 77840029. The reversal of 77839983 is 38993877.

It is not a de Polignac number, because 77839983 - 2⁴ = 77839967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77839483) 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 11 ways as a sum of consecutive naturals, for example, 332533 + ... + 332766.

Almost surely, 2^77839983 is an apocalyptic number.

77839983 is a deficient number, since it is larger than the sum of its proper divisors (43244617).

77839983 is a wasteful number, since it uses less digits than its factorization.

77839983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665318 (or 665315 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 77839983 is about 8822.6970366209. The cubic root of 77839983 is about 426.9734894974.

It can be divided in two parts, 7783 and 9983, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 77839983 in words is "seventy-seven million, eight hundred thirty-nine thousand, nine hundred eighty-three".