912805920 has 144 divisors (see below), whose sum is σ = 3354630552. Its totient is φ = 224686080.

The previous prime is 912805913. The next prime is 912805921. The reversal of 912805920 is 29508219.

It can be written as a sum of positive squares in 4 ways, for example, as 804062736 + 108743184 = 28356^2 + 10428^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (912805921) 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, 5661 + ... + 43100.

Almost surely, 2^912805920 is an apocalyptic number.

912805920 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 912805920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1677315276).

912805920 is an abundant number, since it is smaller than the sum of its proper divisors (2441824632).

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

912805920 is a wasteful number, since it uses less digits than its factorization.

912805920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48795 (or 48784 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 912805920 is about 30212.6781335253. The cubic root of 912805920 is about 970.0470873801.

The spelling of 912805920 in words is "nine hundred twelve million, eight hundred five thousand, nine hundred twenty".