900207720 has 96 divisors (see below), whose sum is σ = 2951699400. Its totient is φ = 237920256.

The previous prime is 900207701. The next prime is 900207731. The reversal of 900207720 is 27702009.

It can be written as a sum of positive squares in 4 ways, for example, as 694744164 + 205463556 = 26358^2 + 14334^2 .

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, 29616 + ... + 51744.

Almost surely, 2^900207720 is an apocalyptic number.

900207720 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 900207720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475849700).

900207720 is an abundant number, since it is smaller than the sum of its proper divisors (2051491680).

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

900207720 is a wasteful number, since it uses less digits than its factorization.

900207720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22259 (or 22252 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 900207720 is about 30003.4618002656. The cubic root of 900207720 is about 965.5636572085.

Adding to 900207720 its reverse (27702009), we get a palindrome (927909729).

The spelling of 900207720 in words is "nine hundred million, two hundred seven thousand, seven hundred twenty".