85388661 has 10 divisors (see below), whose sum is σ = 127556022. Its totient is φ = 56925720.

The previous prime is 85388659. The next prime is 85388683. The reversal of 85388661 is 16688358.

It can be written as a sum of positive squares in only one way, i.e., 82464561 + 2924100 = 9081^2 + 1710^2 .

It is not a de Polignac number, because 85388661 - 2¹ = 85388659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85388561) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 527010 + ... + 527171.

Almost surely, 2^85388661 is an apocalyptic number.

85388661 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

85388661 is a deficient number, since it is larger than the sum of its proper divisors (42167361).

85388661 is a wasteful number, since it uses less digits than its factorization.

85388661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054193 (or 1054184 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 85388661 is about 9240.5985195765. The cubic root of 85388661 is about 440.3520959262.

The spelling of 85388661 in words is "eighty-five million, three hundred eighty-eight thousand, six hundred sixty-one".