1278581424 has 40 divisors (see below), whose sum is σ = 3497298480. Its totient is φ = 401123328.

The previous prime is 1278581401. The next prime is 1278581471. The reversal of 1278581424 is 4241858721.

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, 782629 + ... + 784260.

It is an arithmetic number, because the mean of its divisors is an integer number (87432462).

Almost surely, 2^1278581424 is an apocalyptic number.

It is an amenable number.

1278581424 is an abundant number, since it is smaller than the sum of its proper divisors (2218717056).

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

1278581424 is a wasteful number, since it uses less digits than its factorization.

1278581424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566917 (or 1566911 counting only the distinct ones).

The product of its digits is 143360, while the sum is 42.

The square root of 1278581424 is about 35757.2569417734. The cubic root of 1278581424 is about 1085.3657934030.

The spelling of 1278581424 in words is "one billion, two hundred seventy-eight million, five hundred eighty-one thousand, four hundred twenty-four".