78257636113780 has 12 divisors (see below), whose sum is σ = 164341035838980. Its totient is φ = 31303054445504.

The previous prime is 78257636113757. The next prime is 78257636113801. The reversal of 78257636113780 is 8731163675287.

It can be written as a sum of positive squares in 2 ways, for example, as 14366965382884 + 63890670730896 = 3790378^2 + 7993164^2 .

It is a super-2 number, since 2×78257636113780² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1956440902825 + ... + 1956440902864.

It is an arithmetic number, because the mean of its divisors is an integer number (13695086319915).

Almost surely, 2^{78257636113780} is an apocalyptic number.

It is an amenable number.

78257636113780 is an abundant number, since it is smaller than the sum of its proper divisors (86083399725200).

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

78257636113780 is a wasteful number, since it uses less digits than its factorization.

78257636113780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912881805698 (or 3912881805696 counting only the distinct ones).

The product of its (nonzero) digits is 71124480, while the sum is 64.

The spelling of 78257636113780 in words is "seventy-eight trillion, two hundred fifty-seven billion, six hundred thirty-six million, one hundred thirteen thousand, seven hundred eighty".