397771207680 has 1408 divisors, whose sum is σ = 1726538711040. Its totient is φ = 75644928000.

The previous prime is 397771207571. The next prime is 397771207681. The reversal of 397771207680 is 86702177793.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1408).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 397771207680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397771207681) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 696621795 + ... + 696622365.

It is an arithmetic number, because the mean of its divisors is an integer number (1226234880).

Almost surely, 2^397771207680 is an apocalyptic number.

397771207680 is a gapful number since it is divisible by the number (30) 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 397771207680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (863269355520).

397771207680 is an abundant number, since it is smaller than the sum of its proper divisors (1328767503360).

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

397771207680 is a wasteful number, since it uses less digits than its factorization.

397771207680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 6223392, while the sum is 57.

The spelling of 397771207680 in words is "three hundred ninety-seven billion, seven hundred seventy-one million, two hundred seven thousand, six hundred eighty".