1278550980 has 240 divisors, whose sum is σ = 4733008896. Its totient is φ = 282735360.

The previous prime is 1278550967. The next prime is 1278551003. The reversal of 1278550980 is 890558721.

It is a happy number.

1278550980 is a `hidden beast` number, since 1 + 2 + 7 + 8 + 550 + 98 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 79 ways as a sum of consecutive naturals, for example, 349722 + ... + 353358.

Almost surely, 2^1278550980 is an apocalyptic number.

1278550980 is a gapful number since it is divisible by the number (10) 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 1278550980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2366504448).

1278550980 is an abundant number, since it is smaller than the sum of its proper divisors (3454457916).

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

1278550980 is a wasteful number, since it uses less digits than its factorization.

1278550980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696 (or 3685 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 1278550980 is about 35756.8312354437. The cubic root of 1278550980 is about 1085.3571788718.

The spelling of 1278550980 in words is "one billion, two hundred seventy-eight million, five hundred fifty thousand, nine hundred eighty".