85215783 has 4 divisors (see below), whose sum is σ = 113621048. Its totient is φ = 56810520.

The previous prime is 85215769. The next prime is 85215797. The reversal of 85215783 is 38751258.

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

It is an interprime number because it is at equal distance from previous prime (85215769) and next prime (85215797).

It is not a de Polignac number, because 85215783 - 2⁵ = 85215751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85215733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14202628 + ... + 14202633.

It is an arithmetic number, because the mean of its divisors is an integer number (28405262).

Almost surely, 2^85215783 is an apocalyptic number.

85215783 is a deficient number, since it is larger than the sum of its proper divisors (28405265).

85215783 is a wasteful number, since it uses less digits than its factorization.

85215783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28405264.

The product of its digits is 67200, while the sum is 39.

The square root of 85215783 is about 9231.2395159047. The cubic root of 85215783 is about 440.0547159917.

The spelling of 85215783 in words is "eighty-five million, two hundred fifteen thousand, seven hundred eighty-three".