64047440 has 20 divisors (see below), whose sum is σ = 148910484. Its totient is φ = 25618944.

The previous prime is 64047439. The next prime is 64047463. The reversal of 64047440 is 4474046.

It can be written as a sum of positive squares in 2 ways, for example, as 7376656 + 56670784 = 2716^2 + 7528^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400217 + ... + 400376.

Almost surely, 2^64047440 is an apocalyptic number.

It is an amenable number.

64047440 is an abundant number, since it is smaller than the sum of its proper divisors (84863044).

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

64047440 is a wasteful number, since it uses less digits than its factorization.

64047440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800606 (or 800600 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 64047440 is about 8002.9644507520. The cubic root of 64047440 is about 400.0988089233.

The spelling of 64047440 in words is "sixty-four million, forty-seven thousand, four hundred forty".