1278883557 has 48 divisors (see below), whose sum is σ = 2190240000. Its totient is φ = 703567872.

The previous prime is 1278883553. The next prime is 1278883601. The reversal of 1278883557 is 7553888721.

1278883557 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 8 + 83 + 557 = 666.

1278883557 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1278883557 - 2² = 1278883553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278883553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 819544 + ... + 821102.

It is an arithmetic number, because the mean of its divisors is an integer number (45630000).

Almost surely, 2^1278883557 is an apocalyptic number.

It is an amenable number.

1278883557 is a deficient number, since it is larger than the sum of its proper divisors (911356443).

1278883557 is a wasteful number, since it uses less digits than its factorization.

1278883557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050 (or 2047 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The square root of 1278883557 is about 35761.4814709905. The cubic root of 1278883557 is about 1085.4512785066.

The spelling of 1278883557 in words is "one billion, two hundred seventy-eight million, eight hundred eighty-three thousand, five hundred fifty-seven".