108628991 has 8 divisors (see below), whose sum is σ = 112809984. Its totient is φ = 104490360.

The previous prime is 108628981. The next prime is 108629009. The reversal of 108628991 is 199826801.

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

It is a cyclic number.

It is not a de Polignac number, because 108628991 - 2¹⁸ = 108366847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108628981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5315 + ... + 15668.

It is an arithmetic number, because the mean of its divisors is an integer number (14101248).

Almost surely, 2^108628991 is an apocalyptic number.

108628991 is a deficient number, since it is larger than the sum of its proper divisors (4180993).

108628991 is a wasteful number, since it uses less digits than its factorization.

108628991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21181.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 108628991 is about 10422.5232549513. The cubic root of 108628991 is about 477.1430275163.

The spelling of 108628991 in words is "one hundred eight million, six hundred twenty-eight thousand, nine hundred ninety-one".