78518526438 has 64 divisors (see below), whose sum is σ = 177073309440. Its totient is φ = 23006697600.

The previous prime is 78518526371. The next prime is 78518526481. The reversal of 78518526438 is 83462581587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72256 + ... + 402812.

It is an arithmetic number, because the mean of its divisors is an integer number (2766770460).

Almost surely, 2^78518526438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78518526438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88536654720).

78518526438 is an abundant number, since it is smaller than the sum of its proper divisors (98554783002).

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

78518526438 is a wasteful number, since it uses less digits than its factorization.

78518526438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330693.

The product of its digits is 12902400, while the sum is 57.

The spelling of 78518526438 in words is "seventy-eight billion, five hundred eighteen million, five hundred twenty-six thousand, four hundred thirty-eight".