78927430657440 has 384 divisors, whose sum is σ = 271506622464000. Its totient is φ = 19199369502720.

The previous prime is 78927430657429. The next prime is 78927430657457. The reversal of 78927430657440 is 4475603472987.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55559844 + ... + 56962716.

It is an arithmetic number, because the mean of its divisors is an integer number (707048496000).

Almost surely, 2^{78927430657440} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78927430657440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135753311232000).

78927430657440 is an abundant number, since it is smaller than the sum of its proper divisors (192579191806560).

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

78927430657440 is a wasteful number, since it uses less digits than its factorization.

78927430657440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403140 (or 1403132 counting only the distinct ones).

The product of its (nonzero) digits is 284497920, while the sum is 66.

The spelling of 78927430657440 in words is "seventy-eight trillion, nine hundred twenty-seven billion, four hundred thirty million, six hundred fifty-seven thousand, four hundred forty".