78510251707420 has 48 divisors (see below), whose sum is σ = 177804382986720. Its totient is φ = 28947514242816.

The previous prime is 78510251707417. The next prime is 78510251707427. The reversal of 78510251707420 is 2470715201587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78510251707427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212765242 + ... + 213133921.

It is an arithmetic number, because the mean of its divisors is an integer number (3704257978890).

Almost surely, 2^{78510251707420} is an apocalyptic number.

It is an amenable number.

78510251707420 is an abundant number, since it is smaller than the sum of its proper divisors (99294131279300).

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

78510251707420 is a wasteful number, since it uses less digits than its factorization.

78510251707420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425899894 (or 425899892 counting only the distinct ones).

The product of its (nonzero) digits is 1097600, while the sum is 49.

The spelling of 78510251707420 in words is "seventy-eight trillion, five hundred ten billion, two hundred fifty-one million, seven hundred seven thousand, four hundred twenty".