9780897280 has 480 divisors, whose sum is σ = 30794100480. Its totient is φ = 2893578240.

The previous prime is 9780897277. The next prime is 9780897299. The reversal of 9780897280 is 827980879.

It is a super-2 number, since 2×9780897280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165777891 + ... + 165777949.

It is an arithmetic number, because the mean of its divisors is an integer number (64154376).

Almost surely, 2^9780897280 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 9780897280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15397050240).

9780897280 is an abundant number, since it is smaller than the sum of its proper divisors (21013203200).

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

9780897280 is a wasteful number, since it uses less digits than its factorization.

9780897280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 58.

The square root of 9780897280 is about 98898.4189964632. The cubic root of 9780897280 is about 2138.5836028737.

The spelling of 9780897280 in words is "nine billion, seven hundred eighty million, eight hundred ninety-seven thousand, two hundred eighty".