85757993 has 4 divisors (see below), whose sum is σ = 86333700. Its totient is φ = 85182288.

The previous prime is 85757977. The next prime is 85758011. The reversal of 85757993 is 39975758.

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: 39975758 = 2 ⋅19987879.

It can be written as a sum of positive squares in 2 ways, for example, as 17909824 + 67848169 = 4232^2 + 8237^2 .

It is a cyclic number.

It is not a de Polignac number, because 85757993 - 2⁴ = 85757977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85757293) 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, 287630 + ... + 287927.

It is an arithmetic number, because the mean of its divisors is an integer number (21583425).

Almost surely, 2^85757993 is an apocalyptic number.

It is an amenable number.

85757993 is a deficient number, since it is larger than the sum of its proper divisors (575707).

85757993 is a wasteful number, since it uses less digits than its factorization.

85757993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575706.

The product of its digits is 2381400, while the sum is 53.

The square root of 85757993 is about 9260.5611601026. The cubic root of 85757993 is about 440.9860684647.

The spelling of 85757993 in words is "eighty-five million, seven hundred fifty-seven thousand, nine hundred ninety-three".