86664909 has 24 divisors (see below), whose sum is σ = 124858272. Its totient is φ = 53434080.

The previous prime is 86664901. The next prime is 86664917. The reversal of 86664909 is 90946668.

It is an interprime number because it is at equal distance from previous prime (86664901) and next prime (86664917).

It is not a de Polignac number, because 86664909 - 2³ = 86664901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86664901) 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, 45639 + ... + 47499.

It is an arithmetic number, because the mean of its divisors is an integer number (5202428).

Almost surely, 2^86664909 is an apocalyptic number.

It is an amenable number.

86664909 is a deficient number, since it is larger than the sum of its proper divisors (38193363).

86664909 is a wasteful number, since it uses less digits than its factorization.

86664909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945 (or 1926 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 86664909 is about 9309.3989601907. The cubic root of 86664909 is about 442.5351397291.

The spelling of 86664909 in words is "eighty-six million, six hundred sixty-four thousand, nine hundred nine".