78937842438 has 256 divisors, whose sum is σ = 225945538560. Its totient is φ = 19855300608.

The previous prime is 78937842427. The next prime is 78937842439. The reversal of 78937842438 is 83424873987.

78937842438 is a `hidden beast` number, since 7 + 8 + 93 + 78 + 42 + 438 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78937842439) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 48937720 + ... + 48939332.

It is an arithmetic number, because the mean of its divisors is an integer number (882599760).

Almost surely, 2^78937842438 is an apocalyptic number.

78937842438 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78937842438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112972769280).

78937842438 is an abundant number, since it is smaller than the sum of its proper divisors (147007696122).

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

78937842438 is a wasteful number, since it uses less digits than its factorization.

78937842438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100 (or 2094 counting only the distinct ones).

The product of its digits is 65028096, while the sum is 63.

The spelling of 78937842438 in words is "seventy-eight billion, nine hundred thirty-seven million, eight hundred forty-two thousand, four hundred thirty-eight".