1278620928 has 108 divisors (see below), whose sum is σ = 3970255380. Its totient is φ = 393412608.

The previous prime is 1278620909. The next prime is 1278620989. The reversal of 1278620928 is 8290268721.

1278620928 is a `hidden beast` number, since 12 + 7 + 8 + 620 + 9 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 317124864 + 961496064 = 17808^2 + 31008^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8608 + ... + 51296.

Almost surely, 2^1278620928 is an apocalyptic number.

1278620928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278620928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985127690).

1278620928 is an abundant number, since it is smaller than the sum of its proper divisors (2691634452).

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

1278620928 is a wasteful number, since it uses less digits than its factorization.

1278620928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42724 (or 42707 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 1278620928 is about 35757.8093288725. The cubic root of 1278620928 is about 1085.3769713767.

The spelling of 1278620928 in words is "one billion, two hundred seventy-eight million, six hundred twenty thousand, nine hundred twenty-eight".