654978465 has 24 divisors (see below), whose sum is σ = 1202079528. Its totient is φ = 328773120.

The previous prime is 654978419. The next prime is 654978487. The reversal of 654978465 is 564879456.

It can be written as a sum of positive squares in 4 ways, for example, as 101364624 + 553613841 = 10068^2 + 23529^2 .

It is not a de Polignac number, because 654978465 - 2⁸ = 654978209 is a prime.

It is a super-2 number, since 2×654978465² = 857993579227512450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 427326 + ... + 428855.

It is an arithmetic number, because the mean of its divisors is an integer number (50086647).

Almost surely, 2^654978465 is an apocalyptic number.

It is an amenable number.

654978465 is a deficient number, since it is larger than the sum of its proper divisors (547101063).

654978465 is a wasteful number, since it uses less digits than its factorization.

654978465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856209 (or 856206 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 654978465 is about 25592.5470596422. The cubic root of 654978465 is about 868.4450425242.

Subtracting from 654978465 its reverse (564879456), we obtain a palindrome (90099009).

The spelling of 654978465 in words is "six hundred fifty-four million, nine hundred seventy-eight thousand, four hundred sixty-five".