1278809712920 has 32 divisors (see below), whose sum is σ = 3046576082400. Its totient is φ = 481434244608.

The previous prime is 1278809712907. The next prime is 1278809712931. The reversal of 1278809712920 is 292179088721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 940300580 + ... + 940301939.

It is an arithmetic number, because the mean of its divisors is an integer number (95205502575).

Almost surely, 2^{1278809712920} is an apocalyptic number.

1278809712920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278809712920 is an abundant number, since it is smaller than the sum of its proper divisors (1767766369480).

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

1278809712920 is a wasteful number, since it uses less digits than its factorization.

1278809712920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1880602547 (or 1880602543 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 1278809712920 in words is "one trillion, two hundred seventy-eight billion, eight hundred nine million, seven hundred twelve thousand, nine hundred twenty".