77939563 has 8 divisors (see below), whose sum is σ = 84149856. Its totient is φ = 71760000.

The previous prime is 77939557. The next prime is 77939581. The reversal of 77939563 is 36593977.

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

It is not a de Polignac number, because 77939563 - 2⁹ = 77939051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77939503) 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, 2263 + ... + 12688.

It is an arithmetic number, because the mean of its divisors is an integer number (10518732).

Almost surely, 2^77939563 is an apocalyptic number.

77939563 is a deficient number, since it is larger than the sum of its proper divisors (6210293).

77939563 is a wasteful number, since it uses less digits than its factorization.

77939563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15365.

The product of its digits is 1071630, while the sum is 49.

The square root of 77939563 is about 8828.3386319284. The cubic root of 77939563 is about 427.1554863768.

The spelling of 77939563 in words is "seventy-seven million, nine hundred thirty-nine thousand, five hundred sixty-three".