64741840 has 20 divisors (see below), whose sum is σ = 150524964. Its totient is φ = 25896704.

The previous prime is 64741811. The next prime is 64741867. The reversal of 64741840 is 4814746.

It can be written as a sum of positive squares in 2 ways, for example, as 40653376 + 24088464 = 6376^2 + 4908^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 64741796 and 64741805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404557 + ... + 404716.

Almost surely, 2^64741840 is an apocalyptic number.

It is an amenable number.

64741840 is an abundant number, since it is smaller than the sum of its proper divisors (85783124).

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

64741840 is a wasteful number, since it uses less digits than its factorization.

64741840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809286 (or 809280 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 64741840 is about 8046.2314160109. The cubic root of 64741840 is about 401.5395667332.

The spelling of 64741840 in words is "sixty-four million, seven hundred forty-one thousand, eight hundred forty".