1278561580 has 24 divisors (see below), whose sum is σ = 2697028992. Its totient is φ = 509129472.

The previous prime is 1278561569. The next prime is 1278561601. The reversal of 1278561580 is 851658721.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138877 + ... + 147796.

It is an arithmetic number, because the mean of its divisors is an integer number (112376208).

Almost surely, 2^1278561580 is an apocalyptic number.

1278561580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278561580 is an abundant number, since it is smaller than the sum of its proper divisors (1418467412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278561580 is a wasteful number, since it uses less digits than its factorization.

1278561580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286905 (or 286903 counting only the distinct ones).

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

The square root of 1278561580 is about 35756.9794585617. The cubic root of 1278561580 is about 1085.3601782971.

The spelling of 1278561580 in words is "one billion, two hundred seventy-eight million, five hundred sixty-one thousand, five hundred eighty".