997931280 has 160 divisors (see below), whose sum is σ = 3291110784. Its totient is φ = 249274368.

The previous prime is 997931227. The next prime is 997931303. The reversal of 997931280 is 82139799.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1129719 + ... + 1130601.

Almost surely, 2^997931280 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 997931280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1645555392).

997931280 is an abundant number, since it is smaller than the sum of its proper divisors (2293179504).

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

997931280 is a wasteful number, since it uses less digits than its factorization.

997931280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 48.

The square root of 997931280 is about 31590.0503323436. The cubic root of 997931280 is about 999.3099506080.

The spelling of 997931280 in words is "nine hundred ninety-seven million, nine hundred thirty-one thousand, two hundred eighty".