64149685 has 4 divisors (see below), whose sum is σ = 76979628. Its totient is φ = 51319744.

The previous prime is 64149671. The next prime is 64149703. The reversal of 64149685 is 58694146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21613201 + 42536484 = 4649^2 + 6522^2 .

It is a cyclic number.

It is not a de Polignac number, because 64149685 - 2¹¹ = 64147637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6414964 + ... + 6414973.

It is an arithmetic number, because the mean of its divisors is an integer number (19244907).

Almost surely, 2^64149685 is an apocalyptic number.

It is an amenable number.

64149685 is a deficient number, since it is larger than the sum of its proper divisors (12829943).

64149685 is a wasteful number, since it uses less digits than its factorization.

64149685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12829942.

The product of its digits is 207360, while the sum is 43.

The square root of 64149685 is about 8009.3498487705. The cubic root of 64149685 is about 400.3116009491.

The spelling of 64149685 in words is "sixty-four million, one hundred forty-nine thousand, six hundred eighty-five".