78903838728 has 192 divisors, whose sum is σ = 251244302400. Its totient is φ = 22054602240.

The previous prime is 78903838721. The next prime is 78903838753. The reversal of 78903838728 is 82783830987.

78903838728 is a `hidden beast` number, since 78 + 90 + 383 + 87 + 28 = 666.

It is not an unprimeable number, because it can be changed into a prime (78903838721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22433226 + ... + 22436742.

It is an arithmetic number, because the mean of its divisors is an integer number (1308564075).

Almost surely, 2^78903838728 is an apocalyptic number.

78903838728 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78903838728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125622151200).

78903838728 is an abundant number, since it is smaller than the sum of its proper divisors (172340463672).

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

78903838728 is a wasteful number, since it uses less digits than its factorization.

78903838728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5732 (or 5725 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 63.

The spelling of 78903838728 in words is "seventy-eight billion, nine hundred three million, eight hundred thirty-eight thousand, seven hundred twenty-eight".