77108691 has 16 divisors (see below), whose sum is σ = 112457088. Its totient is φ = 46608000.

The previous prime is 77108677. The next prime is 77108701. The reversal of 77108691 is 19680177.

It is not a de Polignac number, because 77108691 - 2⁹ = 77108179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77108611) 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 15 ways as a sum of consecutive naturals, for example, 10320 + ... + 16146.

It is an arithmetic number, because the mean of its divisors is an integer number (7028568).

Almost surely, 2^77108691 is an apocalyptic number.

77108691 is a deficient number, since it is larger than the sum of its proper divisors (35348397).

77108691 is a wasteful number, since it uses less digits than its factorization.

77108691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6242.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 77108691 is about 8781.1554478895. The cubic root of 77108691 is about 425.6321683238.

It can be divided in two parts, 771086 and 91, that added together give a palindrome (771177).

The spelling of 77108691 in words is "seventy-seven million, one hundred eight thousand, six hundred ninety-one".