897221283840 has 832 divisors, whose sum is σ = 3771581990400. Its totient is φ = 197982683136.

The previous prime is 897221283799. The next prime is 897221283899. The reversal of 897221283840 is 48382122798.

It is a super-3 number, since 3×897221283840³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 112246884 + ... + 112254876.

Almost surely, 2^897221283840 is an apocalyptic number.

897221283840 is a gapful number since it is divisible by the number (80) 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 897221283840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1885790995200).

897221283840 is an abundant number, since it is smaller than the sum of its proper divisors (2874360706560).

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

897221283840 is a wasteful number, since it uses less digits than its factorization.

897221283840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8067 (or 8039 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 897221283840 in words is "eight hundred ninety-seven billion, two hundred twenty-one million, two hundred eighty-three thousand, eight hundred forty".