394825778560 has 128 divisors (see below), whose sum is σ = 970443504000. Its totient is φ = 153530966016.

The previous prime is 394825778449. The next prime is 394825778569. The reversal of 394825778560 is 65877528493.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a junction number, because it is equal to n+sod(n) for n = 394825778492 and 394825778501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394825778569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4437874 + ... + 4525966.

It is an arithmetic number, because the mean of its divisors is an integer number (7581589875).

Almost surely, 2^394825778560 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 394825778560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (485221752000).

394825778560 is an abundant number, since it is smaller than the sum of its proper divisors (575617725440).

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

394825778560 is a wasteful number, since it uses less digits than its factorization.

394825778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88308 (or 88296 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 64.

The spelling of 394825778560 in words is "three hundred ninety-four billion, eight hundred twenty-five million, seven hundred seventy-eight thousand, five hundred sixty".