997795620 has 108 divisors (see below), whose sum is σ = 3215325204. Its totient is φ = 250414080.

The previous prime is 997795597. The next prime is 997795657. The reversal of 997795620 is 26597799.

997795620 is a `hidden beast` number, since 9 + 9 + 7 + 7 + 9 + 5 + 620 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 124947684 + 872847936 = 11178^2 + 29544^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42430 + ... + 61610.

Almost surely, 2^997795620 is an apocalyptic number.

997795620 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997795620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1607662602).

997795620 is an abundant number, since it is smaller than the sum of its proper divisors (2217529584).

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

997795620 is a wasteful number, since it uses less digits than its factorization.

997795620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19230 (or 19208 counting only the distinct ones).

The product of its (nonzero) digits is 2143260, while the sum is 54.

The square root of 997795620 is about 31587.9030643061. The cubic root of 997795620 is about 999.2646660832.

The spelling of 997795620 in words is "nine hundred ninety-seven million, seven hundred ninety-five thousand, six hundred twenty".