88660991 has 4 divisors (see below), whose sum is σ = 91057272. Its totient is φ = 86264712.

The previous prime is 88660939. The next prime is 88661003. The reversal of 88660991 is 19906688.

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 88660991 - 2¹⁴ = 88644607 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 (88560991) 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, 1198085 + ... + 1198158.

It is an arithmetic number, because the mean of its divisors is an integer number (22764318).

Almost surely, 2^88660991 is an apocalyptic number.

88660991 is a deficient number, since it is larger than the sum of its proper divisors (2396281).

88660991 is a wasteful number, since it uses less digits than its factorization.

88660991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2396280.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 88660991 is about 9415.9965484276. The cubic root of 88660991 is about 445.9069010769.

The spelling of 88660991 in words is "eighty-eight million, six hundred sixty thousand, nine hundred ninety-one".