878615486640 has 320 divisors, whose sum is σ = 3207158478720. Its totient is φ = 220322856960.

The previous prime is 878615486627. The next prime is 878615486647. The reversal of 878615486640 is 46684516878.

878615486640 is a `hidden beast` number, since 8 + 7 + 8 + 615 + 4 + 8 + 6 + 6 + 4 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (878615486647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44678410 + ... + 44698070.

It is an arithmetic number, because the mean of its divisors is an integer number (10022370246).

Almost surely, 2^878615486640 is an apocalyptic number.

878615486640 is a gapful number since it is divisible by the number (80) 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 878615486640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1603579239360).

878615486640 is an abundant number, since it is smaller than the sum of its proper divisors (2328542992080).

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

878615486640 is a wasteful number, since it uses less digits than its factorization.

878615486640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20917 (or 20905 counting only the distinct ones).

The product of its (nonzero) digits is 61931520, while the sum is 63.

The spelling of 878615486640 in words is "eight hundred seventy-eight billion, six hundred fifteen million, four hundred eighty-six thousand, six hundred forty".