88187993 has 4 divisors (see below), whose sum is σ = 93375540. Its totient is φ = 83000448.

The previous prime is 88187989. The next prime is 88188029. The reversal of 88187993 is 39978188.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35378704 + 52809289 = 5948^2 + 7267^2 .

It is a cyclic number.

It is not a de Polignac number, because 88187993 - 2² = 88187989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (88187923) 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 3 ways as a sum of consecutive naturals, for example, 2593748 + ... + 2593781.

It is an arithmetic number, because the mean of its divisors is an integer number (23343885).

Almost surely, 2^88187993 is an apocalyptic number.

It is an amenable number.

88187993 is a deficient number, since it is larger than the sum of its proper divisors (5187547).

88187993 is a wasteful number, since it uses less digits than its factorization.

88187993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5187546.

The product of its digits is 870912, while the sum is 53.

The square root of 88187993 is about 9390.8462344988. The cubic root of 88187993 is about 445.1125297202.

The spelling of 88187993 in words is "eighty-eight million, one hundred eighty-seven thousand, nine hundred ninety-three".