64810649 has 4 divisors (see below), whose sum is σ = 65416464. Its totient is φ = 64204836.

The previous prime is 64810631. The next prime is 64810657. The reversal of 64810649 is 94601846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64810649 - 2⁸ = 64810393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64819649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302747 + ... + 302960.

It is an arithmetic number, because the mean of its divisors is an integer number (16354116).

Almost surely, 2^64810649 is an apocalyptic number.

It is an amenable number.

64810649 is a deficient number, since it is larger than the sum of its proper divisors (605815).

64810649 is a wasteful number, since it uses less digits than its factorization.

64810649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605814.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 64810649 is about 8050.5061331571. The cubic root of 64810649 is about 401.6817712870.

The spelling of 64810649 in words is "sixty-four million, eight hundred ten thousand, six hundred forty-nine".