85744665 has 12 divisors (see below), whose sum is σ = 148624164. Its totient is φ = 45730464.

The previous prime is 85744661. The next prime is 85744669. The reversal of 85744665 is 56644758.

It is an interprime number because it is at equal distance from previous prime (85744661) and next prime (85744669).

It can be written as a sum of positive squares in 2 ways, for example, as 34292736 + 51451929 = 5856^2 + 7173^2 .

It is not a de Polignac number, because 85744665 - 2² = 85744661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1905437 = 85744665 / (8 + 5 + 7 + 4 + 4 + 6 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 85744665.

It is not an unprimeable number, because it can be changed into a prime (85744661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 952674 + ... + 952763.

It is an arithmetic number, because the mean of its divisors is an integer number (12385347).

Almost surely, 2^85744665 is an apocalyptic number.

It is an amenable number.

85744665 is a deficient number, since it is larger than the sum of its proper divisors (62879499).

85744665 is a wasteful number, since it uses less digits than its factorization.

85744665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905448 (or 1905445 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 85744665 is about 9259.8415213221. The cubic root of 85744665 is about 440.9632221323.

The spelling of 85744665 in words is "eighty-five million, seven hundred forty-four thousand, six hundred sixty-five".