64064440 has 32 divisors (see below), whose sum is σ = 157250160. Its totient is φ = 23296000.

The previous prime is 64064419. The next prime is 64064443. The reversal of 64064440 is 4446046.

It is a junction number, because it is equal to n+sod(n) for n = 64064399 and 64064408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64064443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72361 + ... + 73240.

Almost surely, 2^64064440 is an apocalyptic number.

It is an amenable number.

64064440 is an abundant number, since it is smaller than the sum of its proper divisors (93185720).

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

64064440 is a wasteful number, since it uses less digits than its factorization.

64064440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145623 (or 145619 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 64064440 is about 8004.0264867128. The cubic root of 64064440 is about 400.1342049675.

The spelling of 64064440 in words is "sixty-four million, sixty-four thousand, four hundred forty".