1284772776820 has 48 divisors (see below), whose sum is σ = 2922755829840. Its totient is φ = 474377624448.

The previous prime is 1284772776769. The next prime is 1284772776821. The reversal of 1284772776820 is 286772774821.

It can be written as a sum of positive squares in 8 ways, for example, as 1136002115556 + 148770661264 = 1065834^2 + 385708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1284772776821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14575687 + ... + 14663566.

It is an arithmetic number, because the mean of its divisors is an integer number (60890746455).

Almost surely, 2^{1284772776820} is an apocalyptic number.

1284772776820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1284772776820 is an abundant number, since it is smaller than the sum of its proper divisors (1637983053020).

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

1284772776820 is a wasteful number, since it uses less digits than its factorization.

1284772776820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29239301 (or 29239273 counting only the distinct ones).

The product of its (nonzero) digits is 29503488, while the sum is 61.

The spelling of 1284772776820 in words is "one trillion, two hundred eighty-four billion, seven hundred seventy-two million, seven hundred seventy-six thousand, eight hundred twenty".