1447428787220 has 72 divisors (see below), whose sum is σ = 3325334403384. Its totient is φ = 528925483008.

The previous prime is 1447428787219. The next prime is 1447428787243. The reversal of 1447428787220 is 227878247441.

It can be written as a sum of positive squares in 12 ways, for example, as 330868844944 + 1116559942276 = 575212^2 + 1056674^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1879529 + ... + 2535248.

It is an arithmetic number, because the mean of its divisors is an integer number (46185200047).

Almost surely, 2^{1447428787220} is an apocalyptic number.

1447428787220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1447428787220 is an abundant number, since it is smaller than the sum of its proper divisors (1877905616164).

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

1447428787220 is a wasteful number, since it uses less digits than its factorization.

1447428787220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4414909 (or 4414894 counting only the distinct ones).

The product of its (nonzero) digits is 11239424, while the sum is 56.

The spelling of 1447428787220 in words is "one trillion, four hundred forty-seven billion, four hundred twenty-eight million, seven hundred eighty-seven thousand, two hundred twenty".