87840811 has 12 divisors (see below), whose sum is σ = 90666400. Its totient is φ = 85082400.

The previous prime is 87840803. The next prime is 87840829. The reversal of 87840811 is 11804878.

It is not a de Polignac number, because 87840811 - 2³ = 87840803 is a prime.

It is a super-3 number, since 3×87840811³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87340811) 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 11 ways as a sum of consecutive naturals, for example, 805825 + ... + 805933.

Almost surely, 2^87840811 is an apocalyptic number.

87840811 is a deficient number, since it is larger than the sum of its proper divisors (2825589).

87840811 is a wasteful number, since it uses less digits than its factorization.

87840811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 87840811 is about 9372.3428767838. The cubic root of 87840811 is about 444.5276492810.

The spelling of 87840811 in words is "eighty-seven million, eight hundred forty thousand, eight hundred eleven".