1247669786880 has 432 divisors, whose sum is σ = 4861170961920. Its totient is φ = 292707532800.

The previous prime is 1247669786873. The next prime is 1247669786921. The reversal of 1247669786880 is 886879667421.

1247669786880 is a `hidden beast` number, since 1 + 2 + 476 + 6 + 9 + 78 + 6 + 8 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 1247669786799 and 1247669786808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3769516 + ... + 4087124.

It is an arithmetic number, because the mean of its divisors is an integer number (11252710560).

Almost surely, 2^{1247669786880} is an apocalyptic number.

1247669786880 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 1247669786880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2430585480960).

1247669786880 is an abundant number, since it is smaller than the sum of its proper divisors (3613501175040).

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

1247669786880 is a wasteful number, since it uses less digits than its factorization.

1247669786880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317678 (or 317661 counting only the distinct ones).

The product of its (nonzero) digits is 390168576, while the sum is 72.

The spelling of 1247669786880 in words is "one trillion, two hundred forty-seven billion, six hundred sixty-nine million, seven hundred eighty-six thousand, eight hundred eighty".