1280047857664 has 45 divisors (see below), whose sum is σ = 2560307247687. Its totient is φ = 639951519744.

The previous prime is 1280047857653. The next prime is 1280047857677. The reversal of 1280047857664 is 4667587400821.

The square root of 1280047857664 is 1131392.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1280047857599 and 1280047857608.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 144813757 + ... + 144822595.

Almost surely, 2^{1280047857664} is an apocalyptic number.

1280047857664 is the 1131392-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280047857664

1280047857664 is an abundant number, since it is smaller than the sum of its proper divisors (1280259390023).

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

1280047857664 is an frugal number, since it uses more digits than its factorization.

1280047857664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17706 (or 8841 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 58.

The spelling of 1280047857664 in words is "one trillion, two hundred eighty billion, forty-seven million, eight hundred fifty-seven thousand, six hundred sixty-four".