907997220 has 144 divisors (see below), whose sum is σ = 3095269632. Its totient is φ = 213776640.

The previous prime is 907997173. The next prime is 907997227. The reversal of 907997220 is 22799709.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (907997227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45385 + ... + 62255.

It is an arithmetic number, because the mean of its divisors is an integer number (21494928).

Almost surely, 2^907997220 is an apocalyptic number.

907997220 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 907997220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1547634816).

907997220 is an abundant number, since it is smaller than the sum of its proper divisors (2187272412).

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

907997220 is a wasteful number, since it uses less digits than its factorization.

907997220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16922 (or 16917 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 907997220 is about 30132.9922178333. The cubic root of 907997220 is about 968.3406710791.

The spelling of 907997220 in words is "nine hundred seven million, nine hundred ninety-seven thousand, two hundred twenty".