1285178056 has 8 divisors (see below), whose sum is σ = 2409708870. Its totient is φ = 642589024.

The previous prime is 1285178021. The next prime is 1285178057. The reversal of 1285178056 is 6508715821.

It can be written as a sum of positive squares in only one way, i.e., 1284075556 + 1102500 = 35834^2 + 1050^2 .

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 (1285178057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80323621 + ... + 80323636.

Almost surely, 2^1285178056 is an apocalyptic number.

It is an amenable number.

1285178056 is a deficient number, since it is larger than the sum of its proper divisors (1124530814).

1285178056 is a wasteful number, since it uses less digits than its factorization.

1285178056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160647263 (or 160647259 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 43.

The square root of 1285178056 is about 35849.3801341111. The cubic root of 1285178056 is about 1087.2291816239.

The spelling of 1285178056 in words is "one billion, two hundred eighty-five million, one hundred seventy-eight thousand, fifty-six".