108391688 has 8 divisors (see below), whose sum is σ = 203234430. Its totient is φ = 54195840.

The previous prime is 108391651. The next prime is 108391721. The reversal of 108391688 is 886193801.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 56580484 + 51811204 = 7522^2 + 7198^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6774473 + ... + 6774488.

Almost surely, 2^108391688 is an apocalyptic number.

It is an amenable number.

108391688 is a deficient number, since it is larger than the sum of its proper divisors (94842742).

108391688 is a wasteful number, since it uses less digits than its factorization.

108391688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13548967 (or 13548963 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 108391688 is about 10411.1328874431. The cubic root of 108391688 is about 476.7953302134.

It can be divided in two parts, 10839168 and 8, that multiplied together give a square (86713344 = 9312²).

The spelling of 108391688 in words is "one hundred eight million, three hundred ninety-one thousand, six hundred eighty-eight".