88218991 has 16 divisors (see below), whose sum is σ = 103057920. Its totient is φ = 73956960.

The previous prime is 88218973. The next prime is 88218997. The reversal of 88218991 is 19981288.

It is not a de Polignac number, because 88218991 - 2⁷ = 88218863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88218997) 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, 68445 + ... + 69721.

It is an arithmetic number, because the mean of its divisors is an integer number (6441120).

Almost surely, 2^88218991 is an apocalyptic number.

88218991 is a deficient number, since it is larger than the sum of its proper divisors (14838929).

88218991 is a wasteful number, since it uses less digits than its factorization.

88218991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494.

The product of its digits is 82944, while the sum is 46.

The square root of 88218991 is about 9392.4965264833. The cubic root of 88218991 is about 445.1646758285.

The spelling of 88218991 in words is "eighty-eight million, two hundred eighteen thousand, nine hundred ninety-one".