7530121720 has 64 divisors (see below), whose sum is σ = 18536364000. Its totient is φ = 2730324480.

The previous prime is 7530121691. The next prime is 7530121723. The reversal of 7530121720 is 271210357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7530121723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129042 + ... + 178078.

Almost surely, 2^7530121720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7530121720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9268182000).

7530121720 is an abundant number, since it is smaller than the sum of its proper divisors (11006242280).

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

7530121720 is a wasteful number, since it uses less digits than its factorization.

7530121720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49408 (or 49404 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 7530121720 is about 86776.2739462810. The cubic root of 7530121720 is about 1960.0508212562.

The spelling of 7530121720 in words is "seven billion, five hundred thirty million, one hundred twenty-one thousand, seven hundred twenty".