64985840 has 40 divisors (see below), whose sum is σ = 151918848. Its totient is φ = 25852160.

The previous prime is 64985831. The next prime is 64985863. The reversal of 64985840 is 4858946.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×64985840³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64985791 and 64985800.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13154 + ... + 17406.

Almost surely, 2^64985840 is an apocalyptic number.

It is an amenable number.

64985840 is an abundant number, since it is smaller than the sum of its proper divisors (86933008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64985840 is a wasteful number, since it uses less digits than its factorization.

64985840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457 (or 4451 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 64985840 is about 8061.3795345462. The cubic root of 64985840 is about 402.0433770838.

The spelling of 64985840 in words is "sixty-four million, nine hundred eighty-five thousand, eight hundred forty".