656478632 has 8 divisors (see below), whose sum is σ = 1230897450. Its totient is φ = 328239312.

The previous prime is 656478631. The next prime is 656478649. The reversal of 656478632 is 236874656.

It can be written as a sum of positive squares in only one way, i.e., 622302916 + 34175716 = 24946^2 + 5846^2 .

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 (656478631) 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 as a sum of consecutive naturals, namely, 41029907 + ... + 41029922.

Almost surely, 2^656478632 is an apocalyptic number.

It is an amenable number.

656478632 is a deficient number, since it is larger than the sum of its proper divisors (574418818).

656478632 is a wasteful number, since it uses less digits than its factorization.

656478632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82059835 (or 82059831 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 47.

The square root of 656478632 is about 25621.8389660071. The cubic root of 656478632 is about 869.1075677167.

The spelling of 656478632 in words is "six hundred fifty-six million, four hundred seventy-eight thousand, six hundred thirty-two".