87919693 has 4 divisors (see below), whose sum is σ = 88029180. Its totient is φ = 87810208.

The previous prime is 87919673. The next prime is 87919697. The reversal of 87919693 is 39691978.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39691978 = 2 ⋅19845989.

It can be written as a sum of positive squares in 2 ways, for example, as 78907689 + 9012004 = 8883^2 + 3002^2 .

It is a cyclic number.

It is not a de Polignac number, because 87919693 - 2⁵ = 87919661 is a prime.

It is a cake number, because a cake can be divided into 87919693 parts by 808 planar cuts.

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 87919693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87919697) 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, 53530 + ... + 55147.

It is an arithmetic number, because the mean of its divisors is an integer number (22007295).

Almost surely, 2^87919693 is an apocalyptic number.

It is an amenable number.

87919693 is a deficient number, since it is larger than the sum of its proper divisors (109487).

87919693 is a wasteful number, since it uses less digits than its factorization.

87919693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109486.

The product of its digits is 734832, while the sum is 52.

The square root of 87919693 is about 9376.5501651727. The cubic root of 87919693 is about 444.6606730184.

The spelling of 87919693 in words is "eighty-seven million, nine hundred nineteen thousand, six hundred ninety-three".