87511761 has 6 divisors (see below), whose sum is σ = 126405890. Its totient is φ = 58341168.

The previous prime is 87511747. The next prime is 87511783. The reversal of 87511761 is 16711578.

It is a happy number.

87511761 is a `hidden beast` number, since 87 + 511 + 7 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 62110161 + 25401600 = 7881^2 + 5040^2 .

It is not a de Polignac number, because 87511761 - 2²⁶ = 20402897 is a prime.

It is a super-2 number, since 2×87511761² = 15316616626642242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87511741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4861756 + ... + 4861773.

Almost surely, 2^87511761 is an apocalyptic number.

It is an amenable number.

87511761 is a deficient number, since it is larger than the sum of its proper divisors (38894129).

87511761 is a wasteful number, since it uses less digits than its factorization.

87511761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9723535 (or 9723532 counting only the distinct ones).

The product of its digits is 11760, while the sum is 36.

The square root of 87511761 is about 9354.7720977050. The cubic root of 87511761 is about 443.9718907211.

The spelling of 87511761 in words is "eighty-seven million, five hundred eleven thousand, seven hundred sixty-one".