997651380 has 96 divisors (see below), whose sum is σ = 3061255680. Its totient is φ = 240753280.

The previous prime is 997651357. The next prime is 997651397. The reversal of 997651380 is 83156799.

It is a congruent number.

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, 146491 + ... + 153149.

It is an arithmetic number, because the mean of its divisors is an integer number (31888080).

Almost surely, 2^997651380 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 997651380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530627840).

997651380 is an abundant number, since it is smaller than the sum of its proper divisors (2063604300).

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

997651380 is a wasteful number, since it uses less digits than its factorization.

997651380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909 (or 6907 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 997651380 is about 31585.6198292831. The cubic root of 997651380 is about 999.2165129751.

The spelling of 997651380 in words is "nine hundred ninety-seven million, six hundred fifty-one thousand, three hundred eighty".