85671649 has 6 divisors (see below), whose sum is σ = 99658914. Its totient is φ = 73432800.

The previous prime is 85671637. The next prime is 85671671. The reversal of 85671649 is 94617658.

It can be written as a sum of positive squares in only one way, i.e., 77792400 + 7879249 = 8820^2 + 2807^2 .

It is not a de Polignac number, because 85671649 - 2¹¹ = 85669601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85671599 and 85671608.

It is not an unprimeable number, because it can be changed into a prime (85671679) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 874152 + ... + 874249.

It is an arithmetic number, because the mean of its divisors is an integer number (16609819).

Almost surely, 2^85671649 is an apocalyptic number.

It is an amenable number.

85671649 is a deficient number, since it is larger than the sum of its proper divisors (13987265).

85671649 is a wasteful number, since it uses less digits than its factorization.

85671649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748415 (or 1748408 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 85671649 is about 9255.8980655580. The cubic root of 85671649 is about 440.8380189523.

It can be divided in two parts, 85671 and 649, that added together give a triangular number (86320 = T₄₁₅).

The spelling of 85671649 in words is "eighty-five million, six hundred seventy-one thousand, six hundred forty-nine".