64806249 has 16 divisors (see below), whose sum is σ = 91699200. Its totient is φ = 40622736.

The previous prime is 64806239. The next prime is 64806251. The reversal of 64806249 is 94260846.

It is not a de Polignac number, because 64806249 - 2⁹ = 64805737 is a prime.

It is a super-3 number, since 3×64806249³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64806239) 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, 3889 + ... + 12030.

It is an arithmetic number, because the mean of its divisors is an integer number (5731200).

Almost surely, 2^64806249 is an apocalyptic number.

64806249 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

64806249 is a deficient number, since it is larger than the sum of its proper divisors (26892951).

64806249 is a wasteful number, since it uses less digits than its factorization.

64806249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16004.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 64806249 is about 8050.2328537751. The cubic root of 64806249 is about 401.6726810124.

The spelling of 64806249 in words is "sixty-four million, eight hundred six thousand, two hundred forty-nine".