78938140398 has 32 divisors (see below), whose sum is σ = 174615768096. Its totient is φ = 23632207488.

The previous prime is 78938140387. The next prime is 78938140399. The reversal of 78938140398 is 89304183987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78938140399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13673161 + ... + 13678932.

It is an arithmetic number, because the mean of its divisors is an integer number (5456742753).

Almost surely, 2^78938140398 is an apocalyptic number.

78938140398 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

78938140398 is an abundant number, since it is smaller than the sum of its proper divisors (95677627698).

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

78938140398 is a wasteful number, since it uses less digits than its factorization.

78938140398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27352148.

The product of its (nonzero) digits is 10450944, while the sum is 60.

The spelling of 78938140398 in words is "seventy-eight billion, nine hundred thirty-eight million, one hundred forty thousand, three hundred ninety-eight".