87872091 has 8 divisors (see below), whose sum is σ = 119887680. Its totient is φ = 57218952.

The previous prime is 87872089. The next prime is 87872107. The reversal of 87872091 is 19027878.

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

It is not a de Polignac number, because 87872091 - 2¹ = 87872089 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (87872051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340461 + ... + 340718.

It is an arithmetic number, because the mean of its divisors is an integer number (14985960).

Almost surely, 2^87872091 is an apocalyptic number.

87872091 is a deficient number, since it is larger than the sum of its proper divisors (32015589).

87872091 is a wasteful number, since it uses less digits than its factorization.

87872091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681225.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 87872091 is about 9374.0114678829. The cubic root of 87872091 is about 444.5804082607.

It can be divided in two parts, 8787 and 2091, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 87872091 in words is "eighty-seven million, eight hundred seventy-two thousand, ninety-one".