1278678672 has 120 divisors (see below), whose sum is σ = 3732618240. Its totient is φ = 408119040.

The previous prime is 1278678649. The next prime is 1278678697. The reversal of 1278678672 is 2768768721.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 529147 + ... + 531557.

It is an arithmetic number, because the mean of its divisors is an integer number (31105152).

Almost surely, 2^1278678672 is an apocalyptic number.

1278678672 is a gapful number since it is divisible by the number (12) 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 1278678672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1866309120).

1278678672 is an abundant number, since it is smaller than the sum of its proper divisors (2453939568).

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

1278678672 is a wasteful number, since it uses less digits than its factorization.

1278678672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581 (or 2572 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 1278678672 is about 35758.6167517705. The cubic root of 1278678672 is about 1085.3933100905.

The spelling of 1278678672 in words is "one billion, two hundred seventy-eight million, six hundred seventy-eight thousand, six hundred seventy-two".