87790091 has 4 divisors (see below), whose sum is σ = 92954232. Its totient is φ = 82625952.

The previous prime is 87790069. The next prime is 87790121. The reversal of 87790091 is 19009778.

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 87790091 - 2¹⁰ = 87789067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87790291) 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 3 ways as a sum of consecutive naturals, for example, 2582045 + ... + 2582078.

It is an arithmetic number, because the mean of its divisors is an integer number (23238558).

Almost surely, 2^87790091 is an apocalyptic number.

87790091 is a deficient number, since it is larger than the sum of its proper divisors (5164141).

87790091 is a wasteful number, since it uses less digits than its factorization.

87790091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5164140.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 87790091 is about 9369.6366525069. The cubic root of 87790091 is about 444.4420748462.

The spelling of 87790091 in words is "eighty-seven million, seven hundred ninety thousand, ninety-one".