78012784 has 40 divisors (see below), whose sum is σ = 164610000. Its totient is φ = 35675136.

The previous prime is 78012769. The next prime is 78012797. The reversal of 78012784 is 48721087.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4392 + ... + 13240.

It is an arithmetic number, because the mean of its divisors is an integer number (4115250).

Almost surely, 2^78012784 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 78012784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82305000).

78012784 is an abundant number, since it is smaller than the sum of its proper divisors (86597216).

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

78012784 is a wasteful number, since it uses less digits than its factorization.

78012784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8905 (or 8899 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 78012784 is about 8832.4845881552. The cubic root of 78012784 is about 427.2892094881.

It can be divided in two parts, 7801 and 2784, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 78012784 in words is "seventy-eight million, twelve thousand, seven hundred eighty-four".