654740640 has 144 divisors (see below), whose sum is σ = 2245265568. Its totient is φ = 173741568.

The previous prime is 654740621. The next prime is 654740657. The reversal of 654740640 is 46047456.

654740640 is a `hidden beast` number, since 6 + 5 + 4 + 7 + 4 + 0 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 654740595 and 654740604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 325879 + ... + 327881.

It is an arithmetic number, because the mean of its divisors is an integer number (15592122).

Almost surely, 2^654740640 is an apocalyptic number.

654740640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654740640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122632784).

654740640 is an abundant number, since it is smaller than the sum of its proper divisors (1590524928).

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

654740640 is a wasteful number, since it uses less digits than its factorization.

654740640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251 (or 2240 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 654740640 is about 25587.9002655552. The cubic root of 654740640 is about 868.3399179760.

The spelling of 654740640 in words is "six hundred fifty-four million, seven hundred forty thousand, six hundred forty".