654061840 has 20 divisors (see below), whose sum is σ = 1520693964. Its totient is φ = 261624704.

The previous prime is 654061819. The next prime is 654061847. The reversal of 654061840 is 48160456.

It can be written as a sum of positive squares in 2 ways, for example, as 85525504 + 568536336 = 9248^2 + 23844^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 654061796 and 654061805.

It is not an unprimeable number, because it can be changed into a prime (654061847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4087807 + ... + 4087966.

Almost surely, 2^654061840 is an apocalyptic number.

It is an amenable number.

654061840 is an abundant number, since it is smaller than the sum of its proper divisors (866632124).

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

654061840 is a wasteful number, since it uses less digits than its factorization.

654061840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8175786 (or 8175780 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 654061840 is about 25574.6327441862. The cubic root of 654061840 is about 868.0397314524.

The spelling of 654061840 in words is "six hundred fifty-four million, sixty-one thousand, eight hundred forty".