85209667 has 4 divisors (see below), whose sum is σ = 85455576. Its totient is φ = 84963760.

The previous prime is 85209653. The next prime is 85209689. The reversal of 85209667 is 76690258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85209667 - 2⁷ = 85209539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85209697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122434 + ... + 123127.

It is an arithmetic number, because the mean of its divisors is an integer number (21363894).

Almost surely, 2^85209667 is an apocalyptic number.

85209667 is a deficient number, since it is larger than the sum of its proper divisors (245909).

85209667 is a wasteful number, since it uses less digits than its factorization.

85209667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245908.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 85209667 is about 9230.9082435045. The cubic root of 85209667 is about 440.0441880553.

The spelling of 85209667 in words is "eighty-five million, two hundred nine thousand, six hundred sixty-seven".