87771811 has 4 divisors (see below), whose sum is σ = 92391400. Its totient is φ = 83152224.

The previous prime is 87771797. The next prime is 87771821. The reversal of 87771811 is 11817778.

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 87771811 - 2⁷ = 87771683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87771821) 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, 2309766 + ... + 2309803.

It is an arithmetic number, because the mean of its divisors is an integer number (23097850).

Almost surely, 2^87771811 is an apocalyptic number.

87771811 is a deficient number, since it is larger than the sum of its proper divisors (4619589).

87771811 is a wasteful number, since it uses less digits than its factorization.

87771811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4619588.

The product of its digits is 21952, while the sum is 40.

The square root of 87771811 is about 9368.6611103188. The cubic root of 87771811 is about 444.4112248759.

The spelling of 87771811 in words is "eighty-seven million, seven hundred seventy-one thousand, eight hundred eleven".