77639108 has 6 divisors (see below), whose sum is σ = 135868446. Its totient is φ = 38819552.

The previous prime is 77639101. The next prime is 77639141. The reversal of 77639108 is 80193677.

It can be written as a sum of positive squares in only one way, i.e., 48888064 + 28751044 = 6992^2 + 5362^2 .

It is not an unprimeable number, because it can be changed into a prime (77639101) 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 as a sum of consecutive naturals, namely, 9704885 + ... + 9704892.

It is an arithmetic number, because the mean of its divisors is an integer number (22644741).

Almost surely, 2^77639108 is an apocalyptic number.

It is an amenable number.

77639108 is a deficient number, since it is larger than the sum of its proper divisors (58229338).

77639108 is a wasteful number, since it uses less digits than its factorization.

77639108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19409781 (or 19409779 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 77639108 is about 8811.3056921208. The cubic root of 77639108 is about 426.6058884238.

The spelling of 77639108 in words is "seventy-seven million, six hundred thirty-nine thousand, one hundred eight".