88115991 has 8 divisors (see below), whose sum is σ = 117536640. Its totient is φ = 58719672.

The previous prime is 88115917. The next prime is 88115999. The reversal of 88115991 is 19951188.

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

It is not a de Polignac number, because 88115991 - 2¹⁰ = 88114967 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88115999) 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 in 7 ways as a sum of consecutive naturals, for example, 5550 + ... + 14388.

It is an arithmetic number, because the mean of its divisors is an integer number (14692080).

Almost surely, 2^88115991 is an apocalyptic number.

88115991 is a deficient number, since it is larger than the sum of its proper divisors (29420649).

88115991 is a wasteful number, since it uses less digits than its factorization.

88115991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12165.

The product of its digits is 25920, while the sum is 42.

The square root of 88115991 is about 9387.0118248567. The cubic root of 88115991 is about 444.9913578257.

The spelling of 88115991 in words is "eighty-eight million, one hundred fifteen thousand, nine hundred ninety-one".