78429551508 has 432 divisors, whose sum is σ = 274670323200. Its totient is φ = 19296688320.

The previous prime is 78429551491. The next prime is 78429551539. The reversal of 78429551508 is 80515592487.

78429551508 is a `hidden beast` number, since 7 + 8 + 42 + 95 + 5 + 1 + 508 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9950313 + ... + 9958191.

Almost surely, 2^78429551508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78429551508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137335161600).

78429551508 is an abundant number, since it is smaller than the sum of its proper divisors (196240771692).

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

78429551508 is a wasteful number, since it uses less digits than its factorization.

78429551508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7942 (or 7921 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 54.

The spelling of 78429551508 in words is "seventy-eight billion, four hundred twenty-nine million, five hundred fifty-one thousand, five hundred eight".