921530880 has 480 divisors, whose sum is σ = 3493062144. Its totient is φ = 223838208.

The previous prime is 921530867. The next prime is 921530887. The reversal of 921530880 is 88035129.

It is a tau number, because it is divible by the number of its divisors (480).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921530887) 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, 19607017 + ... + 19607063.

Almost surely, 2^921530880 is an apocalyptic number.

921530880 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 921530880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1746531072).

921530880 is an abundant number, since it is smaller than the sum of its proper divisors (2571531264).

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

921530880 is a wasteful number, since it uses less digits than its factorization.

921530880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 921530880 is about 30356.7270963126. The cubic root of 921530880 is about 973.1279898755.

The spelling of 921530880 in words is "nine hundred twenty-one million, five hundred thirty thousand, eight hundred eighty".