85649644 has 24 divisors (see below), whose sum is σ = 163220400. Its totient is φ = 39170880.

The previous prime is 85649591. The next prime is 85649647. The reversal of 85649644 is 44694658.

It is a junction number, because it is equal to n+sod(n) for n = 85649594 and 85649603.

It is not an unprimeable number, because it can be changed into a prime (85649647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17227 + ... + 21634.

It is an arithmetic number, because the mean of its divisors is an integer number (6800850).

Almost surely, 2^85649644 is an apocalyptic number.

It is an amenable number.

85649644 is a deficient number, since it is larger than the sum of its proper divisors (77570756).

85649644 is a wasteful number, since it uses less digits than its factorization.

85649644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38913 (or 38911 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 85649644 is about 9254.7092877086. The cubic root of 85649644 is about 440.8002722321.

The spelling of 85649644 in words is "eighty-five million, six hundred forty-nine thousand, six hundred forty-four".