86668640290 has 24 divisors (see below), whose sum is σ = 161198277660. Its totient is φ = 33549147360.

The previous prime is 86668640269. The next prime is 86668640293. The reversal of 86668640290 is 9204686668.

It can be written as a sum of positive squares in 2 ways, for example, as 69546656089 + 17121984201 = 263717^2 + 130851^2 .

It is a super-2 number, since 2×86668640290² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (86668640293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4499685 + ... + 4518904.

Almost surely, 2^86668640290 is an apocalyptic number.

86668640290 is a deficient number, since it is larger than the sum of its proper divisors (74529637370).

86668640290 is a wasteful number, since it uses less digits than its factorization.

86668640290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9018658 (or 9018627 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 55.

The spelling of 86668640290 in words is "eighty-six billion, six hundred sixty-eight million, six hundred forty thousand, two hundred ninety".