87771013 has 36 divisors (see below), whose sum is σ = 108959904. Its totient is φ = 69973200.

The previous prime is 87771011. The next prime is 87771053. The reversal of 87771013 is 31017778.

It is not a de Polignac number, because 87771013 - 2¹ = 87771011 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 87771013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87771011) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2831308 + ... + 2831338.

It is an arithmetic number, because the mean of its divisors is an integer number (3026664).

Almost surely, 2^87771013 is an apocalyptic number.

It is an amenable number.

87771013 is a deficient number, since it is larger than the sum of its proper divisors (21188891).

87771013 is a wasteful number, since it uses less digits than its factorization.

87771013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 34.

The square root of 87771013 is about 9368.6185214257. The cubic root of 87771013 is about 444.4098780455.

The spelling of 87771013 in words is "eighty-seven million, seven hundred seventy-one thousand, thirteen".