87285091 has 4 divisors (see below), whose sum is σ = 87307632. Its totient is φ = 87262552.

The previous prime is 87285073. The next prime is 87285101. The reversal of 87285091 is 19058278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87285091 - 2⁷ = 87284963 is a prime.

It is a super-2 number, since 2×87285091² = 15237374221756562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87285001) 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, 3820 + ... + 13753.

It is an arithmetic number, because the mean of its divisors is an integer number (21826908).

Almost surely, 2^87285091 is an apocalyptic number.

87285091 is a deficient number, since it is larger than the sum of its proper divisors (22541).

87285091 is a wasteful number, since it uses less digits than its factorization.

87285091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22540.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 87285091 is about 9342.6490354717. The cubic root of 87285091 is about 443.5882389704.

The spelling of 87285091 in words is "eighty-seven million, two hundred eighty-five thousand, ninety-one".