654321616 has 40 divisors (see below), whose sum is σ = 1402182824. Its totient is φ = 293829120.

The previous prime is 654321599. The next prime is 654321617. The reversal of 654321616 is 616123456.

It can be written as a sum of positive squares in 4 ways, for example, as 79281216 + 575040400 = 8904^2 + 23980^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654321617) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 34815 + ... + 50206.

Almost surely, 2^654321616 is an apocalyptic number.

It is an amenable number.

654321616 is an abundant number, since it is smaller than the sum of its proper divisors (747861208).

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

654321616 is a wasteful number, since it uses less digits than its factorization.

654321616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85079 (or 85073 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 654321616 is about 25579.7110226054. The cubic root of 654321616 is about 868.1546370206.

The spelling of 654321616 in words is "six hundred fifty-four million, three hundred twenty-one thousand, six hundred sixteen".