87661717 has 24 divisors (see below), whose sum is σ = 108323712. Its totient is φ = 70334880.

The previous prime is 87661703. The next prime is 87661733. The reversal of 87661717 is 71716678.

It is not a de Polignac number, because 87661717 - 2¹⁹ = 87137429 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 (87661747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34968 + ... + 37390.

It is an arithmetic number, because the mean of its divisors is an integer number (4513488).

Almost surely, 2^87661717 is an apocalyptic number.

It is an amenable number.

87661717 is a deficient number, since it is larger than the sum of its proper divisors (20661995).

87661717 is a wasteful number, since it uses less digits than its factorization.

87661717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481 (or 2470 counting only the distinct ones).

The product of its digits is 98784, while the sum is 43.

The square root of 87661717 is about 9362.7836138619. The cubic root of 87661717 is about 444.2253357321.

The spelling of 87661717 in words is "eighty-seven million, six hundred sixty-one thousand, seven hundred seventeen".