997858620 has 72 divisors (see below), whose sum is σ = 3302011440. Its totient is φ = 241904640.

The previous prime is 997858601. The next prime is 997858627. The reversal of 997858620 is 26858799.

It is a happy number.

997858620 is a `hidden beast` number, since 9 + 9 + 7 + 8 + 5 + 8 + 620 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997858627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250005 + ... + 253964.

It is an arithmetic number, because the mean of its divisors is an integer number (45861270).

Almost surely, 2^997858620 is an apocalyptic number.

997858620 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

997858620 is an abundant number, since it is smaller than the sum of its proper divisors (2304152820).

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

997858620 is a wasteful number, since it uses less digits than its factorization.

997858620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503995 (or 503990 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 997858620 is about 31588.9002657579. The cubic root of 997858620 is about 999.2856965587.

The spelling of 997858620 in words is "nine hundred ninety-seven million, eight hundred fifty-eight thousand, six hundred twenty".