78012638 has 32 divisors (see below), whose sum is σ = 130394880. Its totient is φ = 34709760.

The previous prime is 78012637. The next prime is 78012653. The reversal of 78012638 is 83621087.

It is a junction number, because it is equal to n+sod(n) for n = 78012598 and 78012607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78012631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296495 + ... + 296757.

It is an arithmetic number, because the mean of its divisors is an integer number (4074840).

Almost surely, 2^78012638 is an apocalyptic number.

78012638 is a deficient number, since it is larger than the sum of its proper divisors (52382242).

78012638 is a wasteful number, since it uses less digits than its factorization.

78012638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 78012638 is about 8832.4763232063. The cubic root of 78012638 is about 427.2889429323.

The spelling of 78012638 in words is "seventy-eight million, twelve thousand, six hundred thirty-eight".