87771071 has 4 divisors (see below), whose sum is σ = 87819144. Its totient is φ = 87723000.

The previous prime is 87771053. The next prime is 87771091. The reversal of 87771071 is 17017778.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87771071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87771001) 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, 21185 + ... + 24986.

It is an arithmetic number, because the mean of its divisors is an integer number (21954786).

Almost surely, 2^87771071 is an apocalyptic number.

87771071 is a deficient number, since it is larger than the sum of its proper divisors (48073).

87771071 is a wasteful number, since it uses less digits than its factorization.

87771071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48072.

The product of its (nonzero) digits is 19208, while the sum is 38.

The square root of 87771071 is about 9368.6216168655. The cubic root of 87771071 is about 444.4099759357.

The spelling of 87771071 in words is "eighty-seven million, seven hundred seventy-one thousand, seventy-one".