656571428 has 6 divisors (see below), whose sum is σ = 1149000006. Its totient is φ = 328285712.

The previous prime is 656571403. The next prime is 656571439. The reversal of 656571428 is 824175656.

It can be written as a sum of positive squares in only one way, i.e., 337163044 + 319408384 = 18362^2 + 17872^2 .

656571428 is a modest number, since divided by 571428 gives 656 as remainder.

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 as a sum of consecutive naturals, namely, 82071425 + ... + 82071432.

It is an arithmetic number, because the mean of its divisors is an integer number (191500001).

Almost surely, 2^656571428 is an apocalyptic number.

It is an amenable number.

656571428 is a deficient number, since it is larger than the sum of its proper divisors (492428578).

656571428 is a wasteful number, since it uses less digits than its factorization.

656571428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164142861 (or 164142859 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 656571428 is about 25623.6497790615. The cubic root of 656571428 is about 869.1485164505.

The spelling of 656571428 in words is "six hundred fifty-six million, five hundred seventy-one thousand, four hundred twenty-eight".