997679508720 has 320 divisors, whose sum is σ = 3307708293120. Its totient is φ = 248306171904.

The previous prime is 997679508719. The next prime is 997679508737. The reversal of 997679508720 is 27805976799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29012977 + ... + 29047343.

It is an arithmetic number, because the mean of its divisors is an integer number (10336588416).

Almost surely, 2^997679508720 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 997679508720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1653854146560).

997679508720 is an abundant number, since it is smaller than the sum of its proper divisors (2310028784400).

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

997679508720 is a wasteful number, since it uses less digits than its factorization.

997679508720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34552 (or 34546 counting only the distinct ones).

The product of its (nonzero) digits is 120022560, while the sum is 69.

The spelling of 997679508720 in words is "nine hundred ninety-seven billion, six hundred seventy-nine million, five hundred eight thousand, seven hundred twenty".