78857149720320 has 216 divisors, whose sum is σ = 277985403704736. Its totient is φ = 20631807565824.

The previous prime is 78857149720253. The next prime is 78857149720403. The reversal of 78857149720320 is 2302794175887.

78857149720320 is a `hidden beast` number, since 7 + 8 + 8 + 571 + 4 + 9 + 7 + 20 + 32 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63967164 + ... + 65188283.

It is an arithmetic number, because the mean of its divisors is an integer number (1286969461596).

Almost surely, 2^{78857149720320} is an apocalyptic number.

It is an amenable number.

78857149720320 is an abundant number, since it is smaller than the sum of its proper divisors (199128253984416).

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

78857149720320 is a wasteful number, since it uses less digits than its factorization.

78857149720320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129155527 (or 129155510 counting only the distinct ones).

The product of its (nonzero) digits is 47416320, while the sum is 63.

The spelling of 78857149720320 in words is "seventy-eight trillion, eight hundred fifty-seven billion, one hundred forty-nine million, seven hundred twenty thousand, three hundred twenty".