654869128 has 8 divisors (see below), whose sum is σ = 1227879630. Its totient is φ = 327434560.

The previous prime is 654869107. The next prime is 654869129. The reversal of 654869128 is 821968456.

It can be written as a sum of positive squares in only one way, i.e., 431725284 + 223143844 = 20778^2 + 14938^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (654869129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40929313 + ... + 40929328.

Almost surely, 2^654869128 is an apocalyptic number.

It is an amenable number.

654869128 is a deficient number, since it is larger than the sum of its proper divisors (573010502).

654869128 is a wasteful number, since it uses less digits than its factorization.

654869128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81858647 (or 81858643 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 654869128 is about 25590.4108603203. The cubic root of 654869128 is about 868.3967160194.

The spelling of 654869128 in words is "six hundred fifty-four million, eight hundred sixty-nine thousand, one hundred twenty-eight".