7878661791048 has 48 divisors (see below), whose sum is σ = 21399182941500. Its totient is φ = 2618695601280.

The previous prime is 7878661791029. The next prime is 7878661791061. The reversal of 7878661791048 is 8401971668787.

It can be written as a sum of positive squares in 2 ways, for example, as 6384404920644 + 1494256870404 = 2526738^2 + 1222398^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156745443 + ... + 156795698.

Almost surely, 2^{7878661791048} is an apocalyptic number.

It is an amenable number.

7878661791048 is an abundant number, since it is smaller than the sum of its proper divisors (13520521150452).

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

7878661791048 is a wasteful number, since it uses less digits than its factorization.

7878661791048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313541502 (or 313541495 counting only the distinct ones).

The product of its (nonzero) digits is 227598336, while the sum is 72.

The spelling of 7878661791048 in words is "seven trillion, eight hundred seventy-eight billion, six hundred sixty-one million, seven hundred ninety-one thousand, forty-eight".