87771847 has 4 divisors (see below), whose sum is σ = 87850720. Its totient is φ = 87692976.

The previous prime is 87771839. The next prime is 87771851. The reversal of 87771847 is 74817778.

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 87771847 - 2³ = 87771839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87771847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87771247) 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, 37743 + ... + 40000.

It is an arithmetic number, because the mean of its divisors is an integer number (21962680).

Almost surely, 2^87771847 is an apocalyptic number.

87771847 is a deficient number, since it is larger than the sum of its proper divisors (78873).

87771847 is a wasteful number, since it uses less digits than its factorization.

87771847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78872.

The product of its digits is 614656, while the sum is 49.

The square root of 87771847 is about 9368.6630316177. The cubic root of 87771847 is about 444.4112856350.

The spelling of 87771847 in words is "eighty-seven million, seven hundred seventy-one thousand, eight hundred forty-seven".