64089440 has 24 divisors (see below), whose sum is σ = 151411680. Its totient is φ = 25635712.

The previous prime is 64089427. The next prime is 64089457. The reversal of 64089440 is 4498046.

It is a self number, because there is not a number n which added to its sum of digits gives 64089440.

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, 200120 + ... + 200439.

It is an arithmetic number, because the mean of its divisors is an integer number (6308820).

Almost surely, 2^64089440 is an apocalyptic number.

It is an amenable number.

64089440 is an abundant number, since it is smaller than the sum of its proper divisors (87322240).

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

64089440 is a wasteful number, since it uses less digits than its factorization.

64089440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400574 (or 400566 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 64089440 is about 8005.5880483572. The cubic root of 64089440 is about 400.1862466004.

The spelling of 64089440 in words is "sixty-four million, eighty-nine thousand, four hundred forty".