78084814638 has 16 divisors (see below), whose sum is σ = 156172975056. Its totient is φ = 26027713920.

The previous prime is 78084814627. The next prime is 78084814649. The reversal of 78084814638 is 83641848087.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78084814627) and next prime (78084814649).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 245920 + ... + 465452.

It is an arithmetic number, because the mean of its divisors is an integer number (9760810941).

Almost surely, 2^78084814638 is an apocalyptic number.

78084814638 is an abundant number, since it is smaller than the sum of its proper divisors (78088160418).

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

78084814638 is a wasteful number, since it uses less digits than its factorization.

78084814638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278819.

The product of its (nonzero) digits is 8257536, while the sum is 57.

The spelling of 78084814638 in words is "seventy-eight billion, eighty-four million, eight hundred fourteen thousand, six hundred thirty-eight".