87891793 has 4 divisors (see below), whose sum is σ = 95881968. Its totient is φ = 79901620.

The previous prime is 87891767. The next prime is 87891799. The reversal of 87891793 is 39719878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87891793 - 2⁹ = 87891281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87891793.

It is not an unprimeable number, because it can be changed into a prime (87891799) 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, 3995071 + ... + 3995092.

It is an arithmetic number, because the mean of its divisors is an integer number (23970492).

Almost surely, 2^87891793 is an apocalyptic number.

It is an amenable number.

87891793 is a deficient number, since it is larger than the sum of its proper divisors (7990175).

87891793 is a wasteful number, since it uses less digits than its factorization.

87891793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7990174.

The product of its digits is 762048, while the sum is 52.

The square root of 87891793 is about 9375.0622931264. The cubic root of 87891793 is about 444.6136325702.

The spelling of 87891793 in words is "eighty-seven million, eight hundred ninety-one thousand, seven hundred ninety-three".