85785715 has 4 divisors (see below), whose sum is σ = 102942864. Its totient is φ = 68628568.

The previous prime is 85785697. The next prime is 85785719. The reversal of 85785715 is 51758758.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51758758 = 2 ⋅25879379.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85785715 is a prime.

It is a super-2 number, since 2×85785715² = 14718377796122450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85785719) 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, 8578567 + ... + 8578576.

It is an arithmetic number, because the mean of its divisors is an integer number (25735716).

Almost surely, 2^85785715 is an apocalyptic number.

85785715 is a deficient number, since it is larger than the sum of its proper divisors (17157149).

85785715 is a wasteful number, since it uses less digits than its factorization.

85785715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17157148.

The product of its digits is 392000, while the sum is 46.

The square root of 85785715 is about 9262.0578167057. The cubic root of 85785715 is about 441.0335808435.

The spelling of 85785715 in words is "eighty-five million, seven hundred eighty-five thousand, seven hundred fifteen".