87806321 has 4 divisors (see below), whose sum is σ = 87826032. Its totient is φ = 87786612.

The previous prime is 87806273. The next prime is 87806357. The reversal of 87806321 is 12360878.

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 a de Polignac number, because none of the positive numbers 2^k-87806321 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 (87806821) 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, 350 + ... + 13256.

It is an arithmetic number, because the mean of its divisors is an integer number (21956508).

Almost surely, 2^87806321 is an apocalyptic number.

It is an amenable number.

87806321 is a deficient number, since it is larger than the sum of its proper divisors (19711).

87806321 is a wasteful number, since it uses less digits than its factorization.

87806321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19710.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 87806321 is about 9370.5027079661. The cubic root of 87806321 is about 444.4694615756.

It can be divided in two parts, 8780 and 6321, that multiplied together give a triangular number (55498380 = T₁₀₅₃₅).

The spelling of 87806321 in words is "eighty-seven million, eight hundred six thousand, three hundred twenty-one".