997435780 has 96 divisors (see below), whose sum is σ = 2415611520. Its totient is φ = 343094400.

The previous prime is 997435763. The next prime is 997435787. The reversal of 997435780 is 87534799.

It is not an unprimeable number, because it can be changed into a prime (997435787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1508650 + ... + 1509310.

It is an arithmetic number, because the mean of its divisors is an integer number (25162620).

Almost surely, 2^997435780 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 997435780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1207805760).

997435780 is an abundant number, since it is smaller than the sum of its proper divisors (1418175740).

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

997435780 is a wasteful number, since it uses less digits than its factorization.

997435780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 997435780 is about 31582.2066993426. The cubic root of 997435780 is about 999.1445283770.

It can be divided in two parts, 9974 and 35780, that added together give a palindrome (45754).

The spelling of 997435780 in words is "nine hundred ninety-seven million, four hundred thirty-five thousand, seven hundred eighty".