78890667838 has 16 divisors (see below), whose sum is σ = 119571286464. Its totient is φ = 39033676800.

The previous prime is 78890667773. The next prime is 78890667899. The reversal of 78890667838 is 83876609887.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1831606 + ... + 1874182.

It is an arithmetic number, because the mean of its divisors is an integer number (7473205404).

Almost surely, 2^78890667838 is an apocalyptic number.

78890667838 is a deficient number, since it is larger than the sum of its proper divisors (40680618626).

78890667838 is a wasteful number, since it uses less digits than its factorization.

78890667838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52227.

The product of its (nonzero) digits is 195084288, while the sum is 70.

The spelling of 78890667838 in words is "seventy-eight billion, eight hundred ninety million, six hundred sixty-seven thousand, eight hundred thirty-eight".