997758936 has 96 divisors (see below), whose sum is σ = 2751840000. Its totient is φ = 326538432.

The previous prime is 997758907. The next prime is 997758943. The reversal of 997758936 is 639857799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1188805 + ... + 1189643.

It is an arithmetic number, because the mean of its divisors is an integer number (28665000).

Almost surely, 2^997758936 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 997758936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375920000).

997758936 is an abundant number, since it is smaller than the sum of its proper divisors (1754081064).

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

997758936 is a wasteful number, since it uses less digits than its factorization.

997758936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133 (or 1126 counting only the distinct ones).

The product of its digits is 25719120, while the sum is 63.

The square root of 997758936 is about 31587.3223936439. The cubic root of 997758936 is about 999.2524199300.

The spelling of 997758936 in words is "nine hundred ninety-seven million, seven hundred fifty-eight thousand, nine hundred thirty-six".