87213893 has 8 divisors (see below), whose sum is σ = 99447768. Its totient is φ = 75769344.

The previous prime is 87213887. The next prime is 87213899. The reversal of 87213893 is 39831278.

It is an interprime number because it is at equal distance from previous prime (87213887) and next prime (87213899).

It can be written as a sum of positive squares in 4 ways, for example, as 1965604 + 85248289 = 1402^2 + 9233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87213893 - 2¹⁸ = 86951749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87213893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87213899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197096 + ... + 197537.

It is an arithmetic number, because the mean of its divisors is an integer number (12430971).

Almost surely, 2^87213893 is an apocalyptic number.

It is an amenable number.

87213893 is a deficient number, since it is larger than the sum of its proper divisors (12233875).

87213893 is a wasteful number, since it uses less digits than its factorization.

87213893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394663.

The product of its digits is 72576, while the sum is 41.

The square root of 87213893 is about 9338.8378827347. The cubic root of 87213893 is about 443.4675952796.

The spelling of 87213893 in words is "eighty-seven million, two hundred thirteen thousand, eight hundred ninety-three".