654603440 has 40 divisors (see below), whose sum is σ = 1571054208. Its totient is φ = 253393920.

The previous prime is 654603421. The next prime is 654603449. The reversal of 654603440 is 44306456.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 654603397 and 654603406.

It is not an unprimeable number, because it can be changed into a prime (654603449) 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, 129497 + ... + 134456.

Almost surely, 2^654603440 is an apocalyptic number.

It is an amenable number.

654603440 is an abundant number, since it is smaller than the sum of its proper divisors (916450768).

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

654603440 is a wasteful number, since it uses less digits than its factorization.

654603440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263997 (or 263991 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 654603440 is about 25585.2191704507. The cubic root of 654603440 is about 868.2792605940.

Adding to 654603440 its reverse (44306456), we get a palindrome (698909896).

The spelling of 654603440 in words is "six hundred fifty-four million, six hundred three thousand, four hundred forty".