85729387 has 4 divisors (see below), whose sum is σ = 90241480. Its totient is φ = 81217296.

The previous prime is 85729373. The next prime is 85729393. The reversal of 85729387 is 78392758.

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 85729387 - 2²³ = 77340779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85729387.

It is not an unprimeable number, because it can be changed into a prime (85729367) 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, 2256018 + ... + 2256055.

It is an arithmetic number, because the mean of its divisors is an integer number (22560370).

Almost surely, 2^85729387 is an apocalyptic number.

85729387 is a deficient number, since it is larger than the sum of its proper divisors (4512093).

85729387 is a wasteful number, since it uses less digits than its factorization.

85729387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512092.

The product of its digits is 846720, while the sum is 49.

The square root of 85729387 is about 9259.0165244479. The cubic root of 85729387 is about 440.9370302743.

The spelling of 85729387 in words is "eighty-five million, seven hundred twenty-nine thousand, three hundred eighty-seven".