87866071690 has 32 divisors (see below), whose sum is σ = 158819648400. Its totient is φ = 34999910400.

The previous prime is 87866071687. The next prime is 87866071693. The reversal of 87866071690 is 9617066878.

It is an interprime number because it is at equal distance from previous prime (87866071687) and next prime (87866071693).

It can be written as a sum of positive squares in 8 ways, for example, as 14464632361 + 73401439329 = 120269^2 + 270927^2 .

It is a super-2 number, since 2×87866071690² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87866071693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2320510 + ... + 2358070.

Almost surely, 2^87866071690 is an apocalyptic number.

87866071690 is a deficient number, since it is larger than the sum of its proper divisors (70953576710).

87866071690 is a wasteful number, since it uses less digits than its factorization.

87866071690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38538.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 87866071690 in words is "eighty-seven billion, eight hundred sixty-six million, seventy-one thousand, six hundred ninety".