78081256 has 32 divisors (see below), whose sum is σ = 161974080. Its totient is φ = 34988800.

The previous prime is 78081239. The next prime is 78081257. The reversal of 78081256 is 65218087.

78081256 is a nontrivial binomial coefficient, being equal to C(12497, 2).

It is not an unprimeable number, because it can be changed into a prime (78081257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 12496.

It is an arithmetic number, because the mean of its divisors is an integer number (5061690).

Almost surely, 2^78081256 is an apocalyptic number.

78081256 is the 12496-th triangular number.

78081256 is the 4166-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78081256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80987040).

78081256 is an abundant number, since it is smaller than the sum of its proper divisors (83892824).

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

78081256 is a wasteful number, since it uses less digits than its factorization.

78081256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12585 (or 12581 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 78081256 is about 8836.3598840246. The cubic root of 78081256 is about 427.4141838392.

The spelling of 78081256 in words is "seventy-eight million, eighty-one thousand, two hundred fifty-six".