997740220 has 24 divisors (see below), whose sum is σ = 2114481600. Its totient is φ = 395433792.

The previous prime is 997740203. The next prime is 997740221. The reversal of 997740220 is 22047799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997740221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226660 + ... + 231019.

It is an arithmetic number, because the mean of its divisors is an integer number (88103400).

Almost surely, 2^997740220 is an apocalyptic number.

It is an amenable number.

997740220 is an abundant number, since it is smaller than the sum of its proper divisors (1116741380).

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

997740220 is a wasteful number, since it uses less digits than its factorization.

997740220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457797 (or 457795 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 997740220 is about 31587.0261341583. The cubic root of 997740220 is about 999.2461718860.

The spelling of 997740220 in words is "nine hundred ninety-seven million, seven hundred forty thousand, two hundred twenty".