88309991 has 16 divisors (see below), whose sum is σ = 110315520. Its totient is φ = 68678880.

The previous prime is 88309981. The next prime is 88309993. The reversal of 88309991 is 19990388.

It is a cyclic number.

It is not a de Polignac number, because 88309991 - 2²² = 84115687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88309993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60650 + ... + 62088.

It is an arithmetic number, because the mean of its divisors is an integer number (6894720).

Almost surely, 2^88309991 is an apocalyptic number.

88309991 is a deficient number, since it is larger than the sum of its proper divisors (22005529).

88309991 is a wasteful number, since it uses less digits than its factorization.

88309991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 88309991 is about 9397.3395703252. The cubic root of 88309991 is about 445.3176892331.

The spelling of 88309991 in words is "eighty-eight million, three hundred nine thousand, nine hundred ninety-one".