654321056 has 12 divisors (see below), whose sum is σ = 1288194642. Its totient is φ = 327160512.

The previous prime is 654321049. The next prime is 654321071. The reversal of 654321056 is 650123456.

It can be written as a sum of positive squares in only one way, i.e., 450288400 + 204032656 = 21220^2 + 14284^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 20447533 = 654321056 / (6 + 5 + 4 + 3 + 2 + 1 + 0 + 5 + 6).

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223735 + ... + 10223798.

Almost surely, 2^654321056 is an apocalyptic number.

It is an amenable number.

654321056 is a deficient number, since it is larger than the sum of its proper divisors (633873586).

654321056 is a wasteful number, since it uses less digits than its factorization.

654321056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20447543 (or 20447535 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 654321056 is about 25579.7000764278. The cubic root of 654321056 is about 868.1543893510.

The spelling of 654321056 in words is "six hundred fifty-four million, three hundred twenty-one thousand, fifty-six".