397781028736 has 128 divisors (see below), whose sum is σ = 980782387200. Its totient is φ = 156483975168.

The previous prime is 397781028709. The next prime is 397781028767. The reversal of 397781028736 is 637820187793.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1989601 + ... + 2180383.

It is an arithmetic number, because the mean of its divisors is an integer number (7662362400).

Almost surely, 2^397781028736 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 397781028736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (490391193600).

397781028736 is an abundant number, since it is smaller than the sum of its proper divisors (583001358464).

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

397781028736 is a wasteful number, since it uses less digits than its factorization.

397781028736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190996 (or 190984 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 61.

The spelling of 397781028736 in words is "three hundred ninety-seven billion, seven hundred eighty-one million, twenty-eight thousand, seven hundred thirty-six".