85812749 has 4 divisors (see below), whose sum is σ = 93613920. Its totient is φ = 78011580.

The previous prime is 85812737. The next prime is 85812767. The reversal of 85812749 is 94721858.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85812749 - 2¹⁶ = 85747213 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85812709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3900569 + ... + 3900590.

It is an arithmetic number, because the mean of its divisors is an integer number (23403480).

Almost surely, 2^85812749 is an apocalyptic number.

It is an amenable number.

85812749 is a deficient number, since it is larger than the sum of its proper divisors (7801171).

85812749 is a wasteful number, since it uses less digits than its factorization.

85812749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7801170.

The product of its digits is 161280, while the sum is 44.

The square root of 85812749 is about 9263.5170966539. The cubic root of 85812749 is about 441.0799042110.

The spelling of 85812749 in words is "eighty-five million, eight hundred twelve thousand, seven hundred forty-nine".