897781231620 has 432 divisors, whose sum is σ = 3373429917312. Its totient is φ = 189236736000.

The previous prime is 897781231603. The next prime is 897781231643. The reversal of 897781231620 is 26132187798.

It is a happy number.

897781231620 is a `hidden beast` number, since 8 + 9 + 7 + 7 + 8 + 1 + 2 + 3 + 1 + 620 = 666.

It is a super-2 number, since 2×897781231620² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 398835495 + ... + 398837745.

Almost surely, 2^897781231620 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 897781231620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1686714958656).

897781231620 is an abundant number, since it is smaller than the sum of its proper divisors (2475648685692).

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

897781231620 is a wasteful number, since it uses less digits than its factorization.

897781231620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4172 (or 4154 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 897781231620 in words is "eight hundred ninety-seven billion, seven hundred eighty-one million, two hundred thirty-one thousand, six hundred twenty".