78425979840 has 448 divisors, whose sum is σ = 300888806400. Its totient is φ = 19114610688.

The previous prime is 78425979829. The next prime is 78425979859. The reversal of 78425979840 is 4897952487.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11565571 + ... + 11572349.

It is an arithmetic number, because the mean of its divisors is an integer number (671626800).

Almost surely, 2^78425979840 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 78425979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150444403200).

78425979840 is an abundant number, since it is smaller than the sum of its proper divisors (222462826560).

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

78425979840 is a wasteful number, since it uses less digits than its factorization.

78425979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6921 (or 6905 counting only the distinct ones).

The product of its (nonzero) digits is 40642560, while the sum is 63.

The spelling of 78425979840 in words is "seventy-eight billion, four hundred twenty-five million, nine hundred seventy-nine thousand, eight hundred forty".