78251510728460 has 24 divisors (see below), whose sum is σ = 167824516628160. Its totient is φ = 30634633986944.

The previous prime is 78251510728411. The next prime is 78251510728513. The reversal of 78251510728460 is 6482701515287.

It is a happy number.

It is a super-2 number, since 2×78251510728460² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78251510728396 and 78251510728405.

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, 41623143065 + ... + 41623144944.

It is an arithmetic number, because the mean of its divisors is an integer number (6992688192840).

Almost surely, 2^{78251510728460} is an apocalyptic number.

It is an amenable number.

78251510728460 is an abundant number, since it is smaller than the sum of its proper divisors (89573005899700).

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

78251510728460 is a wasteful number, since it uses less digits than its factorization.

78251510728460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83246288065 (or 83246288063 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 56.

The spelling of 78251510728460 in words is "seventy-eight trillion, two hundred fifty-one billion, five hundred ten million, seven hundred twenty-eight thousand, four hundred sixty".