997586280 has 160 divisors (see below), whose sum is σ = 3424861440. Its totient is φ = 260323200.

The previous prime is 997586273. The next prime is 997586297. The reversal of 997586280 is 82685799.

It is a happy number.

997586280 is a `hidden beast` number, since 9 + 9 + 7 + 5 + 8 + 628 + 0 = 666.

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

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 39 ways as a sum of consecutive naturals, for example, 149005 + ... + 155555.

It is an arithmetic number, because the mean of its divisors is an integer number (21405384).

Almost surely, 2^997586280 is an apocalyptic number.

997586280 is a gapful number since it is divisible by the number (90) 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 997586280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1712430720).

997586280 is an abundant number, since it is smaller than the sum of its proper divisors (2427275160).

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

997586280 is a wasteful number, since it uses less digits than its factorization.

997586280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6621 (or 6608 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 997586280 is about 31584.5892802170. The cubic root of 997586280 is about 999.1947784590.

The spelling of 997586280 in words is "nine hundred ninety-seven million, five hundred eighty-six thousand, two hundred eighty".