397778611824 has 360 divisors, whose sum is σ = 1340313745680. Its totient is φ = 109534064640.

The previous prime is 397778611823. The next prime is 397778611907. The reversal of 397778611824 is 428116877793.

397778611824 is a `hidden beast` number, since 3 + 9 + 7 + 7 + 7 + 8 + 611 + 8 + 2 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397778611823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8566879 + ... + 8613185.

It is an arithmetic number, because the mean of its divisors is an integer number (3723093738).

Almost surely, 2^397778611824 is an apocalyptic number.

397778611824 is a gapful number since it is divisible by the number (34) 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 397778611824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (670156872840).

397778611824 is an abundant number, since it is smaller than the sum of its proper divisors (942535133856).

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

397778611824 is a wasteful number, since it uses less digits than its factorization.

397778611824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46389 (or 46369 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The spelling of 397778611824 in words is "three hundred ninety-seven billion, seven hundred seventy-eight million, six hundred eleven thousand, eight hundred twenty-four".