544400640 has 432 divisors, whose sum is σ = 2216742528. Its totient is φ = 120766464.

The previous prime is 544400627. The next prime is 544400657. The reversal of 544400640 is 46004445.

544400640 = T₅₅₆₀ + T₅₅₆₁ + ... + T₅₅₉₄.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3467442 + ... + 3467598.

Almost surely, 2^544400640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 544400640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1108371264).

544400640 is an abundant number, since it is smaller than the sum of its proper divisors (1672341888).

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

544400640 is a wasteful number, since it uses less digits than its factorization.

544400640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 544400640 is about 23332.3946477853. The cubic root of 544400640 is about 816.5313724693.

The spelling of 544400640 in words is "five hundred forty-four million, four hundred thousand, six hundred forty".