654089840 has 20 divisors (see below), whose sum is σ = 1520759064. Its totient is φ = 261635904.

The previous prime is 654089833. The next prime is 654089873. The reversal of 654089840 is 48980456.

It is a happy number.

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 = 654089791 and 654089800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4087982 + ... + 4088141.

Almost surely, 2^654089840 is an apocalyptic number.

It is an amenable number.

654089840 is an abundant number, since it is smaller than the sum of its proper divisors (866669224).

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

654089840 is a wasteful number, since it uses less digits than its factorization.

654089840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8176136 (or 8176130 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 654089840 is about 25575.1801557682. The cubic root of 654089840 is about 868.0521180312.

The spelling of 654089840 in words is "six hundred fifty-four million, eighty-nine thousand, eight hundred forty".