9975528820 has 12 divisors (see below), whose sum is σ = 20948610564. Its totient is φ = 3990211520.

The previous prime is 9975528811. The next prime is 9975528833. The reversal of 9975528820 is 288255799.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7647852304 + 2327676516 = 87452^2 + 48246^2 .

It is a super-2 number, since 2×9975528820² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249388201 + ... + 249388240.

It is an arithmetic number, because the mean of its divisors is an integer number (1745717547).

Almost surely, 2^9975528820 is an apocalyptic number.

It is an amenable number.

9975528820 is an abundant number, since it is smaller than the sum of its proper divisors (10973081744).

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

9975528820 is a wasteful number, since it uses less digits than its factorization.

9975528820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498776450 (or 498776448 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 55.

The square root of 9975528820 is about 99877.5691534391. The cubic root of 9975528820 is about 2152.6758692668.

The spelling of 9975528820 in words is "nine billion, nine hundred seventy-five million, five hundred twenty-eight thousand, eight hundred twenty".