997520280 has 32 divisors (see below), whose sum is σ = 2992561200. Its totient is φ = 266005376.

The previous prime is 997520267. The next prime is 997520291. The reversal of 997520280 is 82025799.

It is a super-2 number, since 2×997520280² = 1990093418022556800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4156215 + ... + 4156454.

Almost surely, 2^997520280 is an apocalyptic number.

It is an amenable number.

997520280 is an abundant number, since it is smaller than the sum of its proper divisors (1995040920).

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

997520280 is a wasteful number, since it uses less digits than its factorization.

997520280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8312683 (or 8312679 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 997520280 is about 31583.5444496022. The cubic root of 997520280 is about 999.1727425004.

The spelling of 997520280 in words is "nine hundred ninety-seven million, five hundred twenty thousand, two hundred eighty".