478878358640 has 80 divisors (see below), whose sum is σ = 1215847466496. Its totient is φ = 173960121600.

The previous prime is 478878358627. The next prime is 478878358697. The reversal of 478878358640 is 46853878874.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×478878358640³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588245 + ... + 1141835.

Almost surely, 2^478878358640 is an apocalyptic number.

478878358640 is a gapful number since it is divisible by the number (40) 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 478878358640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (607923733248).

478878358640 is an abundant number, since it is smaller than the sum of its proper divisors (736969107856).

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

478878358640 is a wasteful number, since it uses less digits than its factorization.

478878358640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554598 (or 554592 counting only the distinct ones).

The product of its (nonzero) digits is 289013760, while the sum is 68.

The spelling of 478878358640 in words is "four hundred seventy-eight billion, eight hundred seventy-eight million, three hundred fifty-eight thousand, six hundred forty".