88999991 has 4 divisors (see below), whose sum is σ = 90253584. Its totient is φ = 87746400.

The previous prime is 88999979. The next prime is 89000027. The reversal of 88999991 is 19999988.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 88999991 - 2²² = 84805687 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 (88999901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626690 + ... + 626831.

It is an arithmetic number, because the mean of its divisors is an integer number (22563396).

Almost surely, 2^88999991 is an apocalyptic number.

88999991 is a deficient number, since it is larger than the sum of its proper divisors (1253593).

88999991 is a wasteful number, since it uses less digits than its factorization.

88999991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1253592.

The product of its digits is 3779136, while the sum is 62.

The square root of 88999991 is about 9433.9806550575. The cubic root of 88999991 is about 446.4744945088.

The spelling of 88999991 in words is "eighty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-one".