64973649 has 16 divisors (see below), whose sum is σ = 94348800. Its totient is φ = 39532416.

The previous prime is 64973641. The next prime is 64973669. The reversal of 64973649 is 94637946.

It is not a de Polignac number, because 64973649 - 2³ = 64973641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64973598 and 64973607.

It is not an unprimeable number, because it can be changed into a prime (64973641) 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 15 ways as a sum of consecutive naturals, for example, 5889 + ... + 12830.

It is an arithmetic number, because the mean of its divisors is an integer number (5896800).

Almost surely, 2^64973649 is an apocalyptic number.

It is an amenable number.

64973649 is a deficient number, since it is larger than the sum of its proper divisors (29375151).

64973649 is a wasteful number, since it uses less digits than its factorization.

64973649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18824.

The product of its digits is 979776, while the sum is 48.

The square root of 64973649 is about 8060.6233629912. The cubic root of 64973649 is about 402.0182351076.

The spelling of 64973649 in words is "sixty-four million, nine hundred seventy-three thousand, six hundred forty-nine".