1530721920 has 256 divisors, whose sum is σ = 6005825280. Its totient is φ = 322928640.

The previous prime is 1530721903. The next prime is 1530721943. The reversal of 1530721920 is 291270351.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 170340 + ... + 179100.

It is an arithmetic number, because the mean of its divisors is an integer number (23460255).

Almost surely, 2^1530721920 is an apocalyptic number.

1530721920 is a gapful number since it is divisible by the number (10) 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 1530721920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3002912640).

1530721920 is an abundant number, since it is smaller than the sum of its proper divisors (4475103360).

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

1530721920 is a wasteful number, since it uses less digits than its factorization.

1530721920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8803 (or 8791 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 1530721920 is about 39124.4414656618. The cubic root of 1530721920 is about 1152.4765582319.

The spelling of 1530721920 in words is "one billion, five hundred thirty million, seven hundred twenty-one thousand, nine hundred twenty".