85649709 has 8 divisors (see below), whose sum is σ = 117286240. Its totient is φ = 55556496.

The previous prime is 85649699. The next prime is 85649737. The reversal of 85649709 is 90794658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85649709 - 2⁷ = 85649581 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85641709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385699 + ... + 385920.

It is an arithmetic number, because the mean of its divisors is an integer number (14660780).

Almost surely, 2^85649709 is an apocalyptic number.

It is an amenable number.

85649709 is a deficient number, since it is larger than the sum of its proper divisors (31636531).

85649709 is a wasteful number, since it uses less digits than its factorization.

85649709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771659.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 85649709 is about 9254.7127994336. The cubic root of 85649709 is about 440.8003837407.

The spelling of 85649709 in words is "eighty-five million, six hundred forty-nine thousand, seven hundred nine".