64435649 has 4 divisors (see below), whose sum is σ = 64452036. Its totient is φ = 64419264.

The previous prime is 64435643. The next prime is 64435687. The reversal of 64435649 is 94653446.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27615025 + 36820624 = 5255^2 + 6068^2 .

It is a cyclic number.

It is not a de Polignac number, because 64435649 - 2⁴ = 64435633 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 (64435643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1637 + ... + 11469.

It is an arithmetic number, because the mean of its divisors is an integer number (16113009).

Almost surely, 2^64435649 is an apocalyptic number.

It is an amenable number.

64435649 is a deficient number, since it is larger than the sum of its proper divisors (16387).

64435649 is an equidigital number, since it uses as much as digits as its factorization.

64435649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16386.

The product of its digits is 311040, while the sum is 41.

The square root of 64435649 is about 8027.1818840736. The cubic root of 64435649 is about 400.9055504821.

The spelling of 64435649 in words is "sixty-four million, four hundred thirty-five thousand, six hundred forty-nine".