85689640 has 16 divisors (see below), whose sum is σ = 192801780. Its totient is φ = 34275840.

The previous prime is 85689629. The next prime is 85689647. The reversal of 85689640 is 4698658.

It can be written as a sum of positive squares in 2 ways, for example, as 70526404 + 15163236 = 8398^2 + 3894^2 .

It is not an unprimeable number, because it can be changed into a prime (85689647) 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, 1071081 + ... + 1071160.

Almost surely, 2^85689640 is an apocalyptic number.

It is an amenable number.

85689640 is an abundant number, since it is smaller than the sum of its proper divisors (107112140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85689640 is a wasteful number, since it uses less digits than its factorization.

85689640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142252 (or 2142248 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 85689640 is about 9256.8698813368. The cubic root of 85689640 is about 440.8688753743.

It can be divided in two parts, 85 and 689640, that added together give a triangular number (689725 = T₁₁₇₄).

The spelling of 85689640 in words is "eighty-five million, six hundred eighty-nine thousand, six hundred forty".